Before DNA detection technology was widely used in the field of criminal investigation, fingerprints were the "first place in criminal physical evidence".

Therefore, the Japanese National Police Agency has been trying to establish a nationwide fingerprint database since the beginning of the 19th century, but this matter is too difficult, and even in Japan there are some disputes about the privacy of ordinary people, and the Japanese National Police Agency can only collect the fingerprints of criminal offenders.

In other words, whoever has committed a crime will have their fingerprints in the police fingerprint database, which can be identified by the second-generation "Infrared Region Distributed Photosensitive Fingerprint Comparison System".

At present, the efficiency is a bit low, and it is not yet possible to completely get rid of manual work, and the system can only pick out similar fingerprints from the fingerprint database through regional key point comparison, and the last step of confirmation still needs to be done manually.

If we want to improve efficiency, we can only wait for the further development of computer technology, and it will probably not be until the beginning of the 21st century, around 2003, that all this work can be done by computers.

But now it's almost enough, Kikuma Kuji was compared and retrieved in this way, a large number of fingerprints were found in Sukada Yukio's study, excluding the Sukada family, among the unfamiliar fingerprints, only Kikuma Kuji's fingerprints were identified by comparison - on a Western clock placed on the desk, the decorative meaning is greater than the practical significance.

Nanahara Takeshi wore white gloves, carefully picked up the Western clock and looked at it repeatedly for a while, and found that the small grandfather clock was working normally, showing the current time, although the appearance was exquisite and chic, and it was a bit old, but it was not an antique, and the market price was about 10,000 yen.

Kiyomi Ruri stood on tiptoe, followed for a while, and asked in a low voice, "Is there something wrong?"

Nanahara Takeshi twisted the clockwork, opened the back cover of the small Western table clock, took a look at the mechanical structure inside, shook his head, and said, "I don't see anything wrong, it's just an ordinary ornament."

"Then why does it have Kuji Kikuma's fingerprints on it?" Kiyomi Ruri said inexplicably, "In this room, only the clock has his fingerprints on it, and he must have something to do with this clock."

Qiyuan Wu put down the small Western grandfather clock, looked at the study, picked up the fingerprint comparison report and looked at it, and muttered: It may not have anything to do with this clock.

"Why?" Kiyomi Ruri picked up the small table clock and began to study it, asking.

"The desk and chair in the study must have been wiped down often, and even if he had fingerprints, they should have been wiped off a long time ago." Takeshi Nanahara made a gesture of holding the table clock casually, "Judging from the fingerprint comparison report, only the thumb and little finger on the fingerprint on the clock look more like the ones left after daily wiping, so Hisashi Kikuma may not have moved only this one thing."

Kiyomi Ruri pondered for a moment and felt that what he said was not unreasonable.

Sukada Yukio seems to often stay in the study, and even this is where he chats with friends, such as tables and chairs, not to mention wiping them every day, wiping them every two or three days, and there are fingerprints that can't be saved, but this clock has a unique shape, and it is not a particularly important thing, if you wipe it, you can leave some fingerprints

But she thought for a moment and asked Nanahara Takeshi, "But it shouldn't stay for more than five years, right?"

Nanahara nodded: "This is indeed a bit strange, he is likely to have been here recently."

Kiyomi Ruri was a little puzzled, and muttered, "Could it be that Sister Eri is mistaken, he is not actually dead? But he's still a felon, and he should be in prison if he doesn't die, so why did he come here?"

As soon as she finished speaking, Eri Nakano, who had just called to verify the situation, came back, her face was very serious, and she said directly, "I called and asked, five and a half years ago, Kuji Kikuma did die in the detention center while he was awaiting trial, and the cause of death was also cyanide poisoning, and I have asked people to take the case file of that year to see what is going on."

There is no problem with her memory, theoretically speaking, Kuji Kikuma is indeed dead, and there was a lot of turmoil back then.

It is not uncommon for prisoners to commit suicide, such as hanging and the like, there will always be one or two after a while, but it is a big problem to commit suicide by taking poison during detention, where did this poison come from, and it took a long time to check it, even if nothing was found in the end, there are still many people in the detention center who have been punished for this.

Now the problem is even more serious, and the dead prisoners have reappeared.

If something like this really happens, I want to be bigger

It is simply impossible to turn a small matter into a trivial matter, and many people will go to prison because of the police officers on the other side of the detention center.

Nanahara thought for a moment and said, "I'll go meet the victim's family first." This case is really a bit troublesome, so let's go and see if it was He Sutian's own family who committed the crime, and then talk about "resurrection from the dead".

"Okay." Eri Nakano has no opinion, "I'll ask the detention center again to find out how Hisashi Kikuma was in the detention center at that time."

Let's ask from the side first, I can't reveal the possibility that Hisashi Kikuma is alive for the time being, so as not to cause other troubles If it's true, the Hirano judicial police are really going to have a big incident!

She turned around and left, and Takeshi Nanahara and Ruri Kiyomi went to the living room of the villa, and Sukada Yukio's wife, Sukada Sasa's servant Mitsuko Asaeda, and Sukada Yukio's daughter, Mai Sukada, were asked to stay here for the time being, and a female police officer was accompanying them, or rather monitoring them, and the forensic division was still searching around the villa! 「

Sugata Sayoko is in her forties, she is not middle-aged and fat, and her figure and appearance are well maintained, but her face is pale at this moment, her eyes are red and swollen from crying, and she is sitting on the sofa Wu Guo is distracted.

Her daughter, Sugata Manong, sat in a wheelchair next to the sofa and reached out to hold one of Sayoko's hands in Sukata and silently shared her grief.

The maid Mitsuko Asae looked to be in her thirties, and her face was also pale, probably because she didn't expect such a tragedy to happen to her employer's family, her eyes were panicked, and she wrung her hands desperately.

She was the first to notice that Nanahara Takeshi was coming, and quickly got up and reminded, "Madam, Miss Mai, that Nanahara-san is here."

Nanahara Takeshi is now a little celebrity in Hirano, after all, he is also idle and has nothing to do, so he teamed up with Sanae Takura, the unscrupulous little reporter, to post soft articles in the newspaper to blow himself, and he has been more active recently, and he poured dirty water on the mysterious man X in the newspaper every three or five days, although he didn't let the mysterious man X attack him angrily, but his reputation was really a lot.

Of course, the fame is not so big that it can be recognized at a glance on the street, in fact, it is not as good as some wild idols in Hirarano, mainly because it is a little strange that he and Kiyomi Ruri, a pair of high school students, ran to the scene of the murder, just now these three people asked the accompanying policewoman and knew that he was a senior adviser to the police station.

Lady Sukada and Mai Sukada both came back to their senses and looked at Takeshi Nanahara and Ruri Kiyomi in unison

Qiyuan Wu said softly, "Madam, please also mourn."

Mrs. Sukada's tears flowed down in an instant, and she was choked up and couldn't speak, it seemed that the relationship between the husband and wife was good. Mai Sukada sat in a wheelchair, bent down slightly, and said for her mother, "Thank you."

Kiyomi Ruri also bent down slightly to return the salute, looked up and looked carefully at Mai Sukada, and found that she was thirteen or fourteen years old, slender and small, wearing a clean and tidy school uniform, with long black and beautiful hair, and her bangs were neatly groomed.

The skin is very white and tender, the eyes are big, the eyelashes are very long, I have just cried, the eye circles are a little red but the water is flowing, and the eyes are slightly drooping, Chu Chu is pitiful, just like a large Japanese doll - if you change into a kimono and do not sit in a wheelchair, Mai Sukada looks like a Japanese doll from appearance to temperament.

Kiyomi Ruri only glanced at it, even a girl couldn't help but feel pity, a little sympathy for her to be in a wheelchair at such a young age, and sympathy for her life to be so unsmooth, and to suffer the pain of losing her father at a young age.

Nanahara Takeya glanced at Mai Sukada, smiled gently at her, and then turned to Mrs. Sukada and said, "Sorry Madam, I need to ask a few questions if it's convenient."

I've already made a record before, but Sayoko Sugata is the wife of a sick retired criminal policeman, and she understands that it is normal to be questioned repeatedly when she encounters a case, so she wiped her tears and said, "Please ask."

"You found out that Sukada-san was killed?"

"Yes, Yaguchi-san called to ask ......," Mrs. Sukada choked up again, "I came to ask him if he wanted to go fishing together on the weekend, so I went to the study to answer the phone with him, and as soon as I opened the door, I saw him fall to the ground." At that time, I thought he had a heart attack again, so I hurriedly asked Manzi to get medicine, but when I looked at him, I found that he ......" Later, I asked Manzi to call the police.

"You've touched the body?"

"Yes

I'm sorry, I moved, but I didn't move too much, I heard him talk about some criminal police cases before, and I was only sure that he was indeed ...... It's gone, and then nothing is done." Mrs. Sukada began to wipe her tears again, when her husband was bleeding from his mouth and nose, and the whites of his eyes were also congested, which was not at all like a heart attack, and he was poisoned to death at first glance, and he didn't even need to call an ambulance.

"You were the second to arrive at the scene of the crime?" Nanahara Takeshi turned his head and looked at the servant Asaeda Mitsuko and asked, Asaeda Mitsuko's face turned even paler, and he wrung his hands and said in a trembling voice, "Yes."

"Where were you before?"

"I'm washing dishes in the kitchen." Mitsuko Asaeda's voice was still trembling, "I ran up when I heard Madame screaming, and as soon as I entered the door, I heard Madame say that the old man was poisoned, and I called the police, so I hurried to call 110, and after calling 110, I went back upstairs and accompanied Madame."

Takeshi Nanahara took a closer look at her face, then turned to Mai Sukada and asked, "Where was Sukada-san at that time?"

Mai Sukada was holding a tissue for Sayoko Sukada, and replied with red eyes, "I was not at home at the time, I was in school all day, and I didn't know until I got home after school in the afternoon...... I knew my father was gone, and I stayed here with my mother."

Nanahara Takeya carefully looked at her facial expression, and then asked the servant Asaeda Mitsuko, "You prepared the tea?"

Asaeda Mitsuko's body trembled, and he said in a thick nasal voice: "Yes, I prepared it, and Lao Te took it himself, but...... But I didn't poison it, I really didn't poison it, I worked here for more than seven years, and I won't hurt anyone, please be sure to investigate, it's really not me!"

Lady Sukada seemed to react at this time, looking blankly at Asaeda Mitsuko, while Nanahara Takeshi nodded and said, "Don't worry, it will definitely be investigated."

Mitsuko Asae glanced cautiously at Mrs. Sukada and nodded in a choked voice. "Please, please be sure to investigate clearly, I won't hurt anyone, I didn't do anything."

She is so afraid, sitting here for an afternoon, she has recalled a series of unjust, false and wrongful cases in the TV series, after all, that cup of tea was really made by her, she is most like a murderer, and she is afraid that the police will determine that the poison is her.

Nanahara Takeshi reassured her again, and then asked, "Has anyone been here today?"

"Nope." Mitsuko Asae immediately said, "From the morning after Mai-sama went to school until the police came, the gate was never opened."

Nanahara Takeshi looked at Mrs. Sukada again, and Mrs. Sukada nodded subconsciously, proving that she was right, no one had indeed entered this small villa before the incident, at least she had not seen or heard outsiders come in.

But her grief subsided a little at this time, and she also reacted a little, there were only three people in the small villa at that time, and now her husband is dead, and the poison is not from her, so it can only be the maid Asaeda Manko, but ......

But she couldn't figure out why Asaeda Manko poisoned and killed her husband, after so many years of getting along, she knew Asaeda Mitsuko's personality, and she felt that she was not the kind of person with bad intentions.

It's just two suspects, and no one else!

She asked Asaeda blankly, "Really, isn't it, are you?"

"It's really not me, I won't hurt anyone." Asaeda became more and more frightened, looked at Mrs. Sukada, and said in a trembling voice, "Isn't it you, madam?"

Eri Nakano and the others will definitely not inform them of the investigation of the case, these two people only know that Sukada Yukio was poisoned to death, and they are instinctively suspicious of that cup of tea, and although the cup of tea was made by Asaeda Manko, but Asaeda Manko can't guarantee whether Sayoko Sukada took advantage of her inattention at that time and added some ingredients or something.

After all, there are only two suspects, it's not her, it must be Sayoko Sugata who murdered her husband.

Mrs. Sukada was stunned for a moment, and said bitterly, "How could I do such a thing, we have been married for more than ten years."

Mitsuko Asaeda's mouth opened, and she had nothing to say for a while.

She felt that there was no one else but Sayoko Sukata, but ...... She couldn't figure out why Sayoko poisoned her husband, usually it seems that the relationship between the two is very good, and Sayoko's personality doesn't look like she has the courage to kill.

Mai Sukada sat in a wheelchair, held the hands of each of them, and wept, "Mother

, Aunt Manzi, please don't do this, I believe it's not you, there must be other reasons."

Nanahara Takeshi sat aside and looked at the three of them, and said softly, "That's right, the facts are not clear now, and there is no point in suspecting each other, please trust the police...... Or I'll look into it, so don't worry."

Lady Sukada and Mitsuko Asaeda both nodded with teary eyes and choked up in unison, "Then please."

Nanahara Takeshi turned around and asked about Sukada Yukio's daily life, friends, and the financial situation of Sukada's family, and Mrs. Sukada and Asaeda Mitsuko answered honestly.

Yukio Sukada retired, and he had heart disease, but he didn't stay at home and didn't go out, he participated in several clubs, from fishing, raising flowers to playing chess, reading, and participated in various activities, and from time to time he also did some public welfare activities, and his hobbies were quite rich.

The financial situation of the Sukada family is also very good, the family is quite rich, there is no luxury expenses, and no one gambles to prostitute money, so there is not much trouble.

If there is no problem with money, the family atmosphere will be more harmonious, including the maids, and there will be no contradictions in life.

Nanahara Takeshi asked carefully, but he didn't find any questions, and after a moment of silence, he asked again, "Who has visited Sugata-san in the last month or two, and has been received by Suga-san in the study?"

"Katori-san, Shido-san, Yaguchi-san, Mr. Takanomiya, Ito-san" Mrs. Sukada immediately reported a string of Sugata Yukio has many hobbies and friends, and old colleagues from the past will occasionally come to talk to him, "When they chat, they usually go to the study, sometimes four or five at a time. There should be a few more, but I can't remember the time."

"There are also Ota-san, Seda-san, An Shen-san, and the police station occasionally sends people to visit......" As a servant, Mitsuko Asae added five or six more people, some of whom had eaten or stayed overnight at Sukada's house.

"Uncle Guba and Uncle Gu have also been here." Mai Sukada, a daughter, also helped to recall, "Uncle Gu often came to play chess with my father, and the second priest of the church also brought people here."

There were a lot of people, Nanahara Takeshi turned around and asked someone to bring a pen and paper, and said, " Then please recall the three of you and make a list!"

If you don't ask who poisoned her, the matter of Kuji Kikuma's "resurrection" becomes more and more suspicious, he must have been to Sukada Yukio's study recently-fingerprints also have an expiration date, and they will gradually decompose and blur over time, depending on the environment and the attached material.

Under the premise that there is no harsh objective environment (heavy rain, exposure to the sun, etc.) and man-made damage (erasure, covering, etc.), fingerprints can usually exist naturally for three days to several years depending on the attached material.

For example, if you press it on an indoor wall, your fingerprint may not be recognizable in a day or two, but if you change it to a glass or mirror, the shelf life of your fingerprint can be extended by a few weeks or even months.

If you change the paper, the time can be longer, half a year to several years, depending on what kind of paper it is, if the fingerprint is sandwiched in a book, or a page in a document, or placed in a safe, it is possible to identify it in two or three years.

At the same time, it is necessary to divide people, some people sweat a lot of hands or have a high amount of oil secretion on their hands, and the shelf life of fingerprints will be extended simultaneously. If it is stained with viscous liquids such as blood, it is more secure, and it can still be used to identify it for years or even more than ten years.

The shelf life of fingerprints should be analyzed on a case-by-case basis, so in this case, the material of the shell of the Western small grandfather clock is smooth metal, and it is in a study that is not too ventilated, and Nanahara Takeshi estimates that the shelf life of fingerprints should be less than two months, so by the way, who has been to the study in these two months, but there is no need to explain in detail.

The three members of the Sukada family had no opinion and began to write the list, while he got up and walked to the kitchen of the Sukada family to continue his investigation.

Kiyomi Ruri followed behind his buttocks, still wondering who poisoned him, there are only two suspects at present, but she listened to it for a long time, and she also tried to observe the words, and in the end she didn't find out who was more suspicious.

The maid Asaeda Mitsuko was scared, but that fear was not like the fear of a weak heart, but more like scaring herself, afraid that she would be wronged.

Although his wife, Sayoko Sukada, was not afraid that she would be wronged, she looked too sad to think of this for a while

I don't think I have the possibility of a murderer at all, and I don't look like I poisoned my husband.

Not to mention her daughter Mai Sukada, she said that she was at school, and she wanted a large number of classmates to prove that it was impossible for her to tell such a lie that could be easily debunked, and the case had nothing to do with her.

If an outsider commits a crime, the study window is locked from the inside, she and Nanahara Takeshi have checked, and they haven't found any problems, only the study door can enter and exit, but the two women are on the first floor, one in the living room, one in the kitchen, and it is impossible for them not to find someone from the first floor to the second floor......

Or maybe someone from the back of the villa sneaked through the windows of the other rooms, went straight to the second floor, and went into the study to feed Yukio Sukada poison

But it's hard to make sense, Sukada Yukio is not a three-year-old child, someone sneaks in to give him poison, or gives him a candy or a piece of cake, he can't eat it without saying a word, right?

Or knock him out and feed him hard? But the desk is behind the window and the door, and it is impossible for someone to open the door and not find it, let alone a senior former criminal policeman, even ordinary people cannot be successfully attacked.

And it can knock people unconscious, and it doesn't make sense to feed poison at all, isn't it good to stab a few times directly?

The key is also how the murderer poisoned him!

Kiyomi Ruri was a little overloaded with pig brains, and he didn't come up with a possible method, so he could only rely on Nanahara Takeshi to figure it out by himself, and when he had a preliminary idea, he would say a few more words at that time.

As a heroine, you don't have to do everything, just wake up the male protagonist at a critical moment.

Let's hope he'll find out!