As the working hours approached, a large number of people wearing monotonous professional suits poured out from here, starting a busy day. Nine out of ten office workers who came out of Sakurada Gate at this time were enviable civil servants, and they were the most enviable group of civil servants working in Chiyoda Ward among the RB bureaucracy.

A petite beauty walked out of Sakurada Gate and stopped on the side of the road to wait for the red light to end. Perhaps because of her outstanding appearance, many men secretly look at this charming woman from time to time. And the beauty seems to have become accustomed to this. She straightened her outfit and pulled her badge from her pocket and hung it around her neck. If someone can see the contents of the badge at this time, they will definitely feel sorry for such a beautiful woman. Because on the job column, the words forensic researcher of the Crime Department of the Metropolitan Police Department are prominently written.

The long red light finally ended, and Chiyo Tanaka crossed the road with her high heels, and the rhythmic sound of her heels hitting the ground was heard under her feet. After crossing Sakurada Avenue from Sakurada Gate Station, walk back a few hundred meters to the Metropolitan Police Department. Chiyo followed the crowd into the building, swiped his card through the turnstile in the lobby, and took the elevator to his floor. At this moment, a familiar voice suddenly came from behind him.

"Chiyo-chan, oh hayo!"

"Yuriko, don't you have to be late today?"

Chiyo Tanaka greeted her happily when she saw Yuriko, who had joined the Metropolitan Police Department in the same term as herself.

"My boyfriend sent me here, Chiyo-chan, how was yesterday's friendship?" asked Yuriko with a gossipy face.

"Deep Blow!" As soon as I heard that I was a forensic researcher, the atmosphere of the scene changed! I vowed never to participate in the friendship again!" Chiyo Tanaka said with a long sigh.

"Oh! Chiyo-chan is so pitiful, why is her fate so different when she works at the Metropolitan Police Department!" Yuriko said as she raised her left hand and showed it off in front of Chiyo Tanaka. Yuriko is showing off the diamond ring in her hand.

"Yuriko, I'm going to break up with you!" Chiyo said through gritted teeth.

……

The two parted ways after reaching the end of the corridor, and each returned to his own department to work, and Yuriko worked in the Planning Division of the General Affairs Department, and her main job was to be in charge of the publicity and planning of the Metropolitan Police Department, so that she did not have to deal with cunning and murderous criminals, nor did she have to face cold corpses.

Chiyo is not so lucky, as a forensic researcher, her job is to deal with corpses, and when it comes to social interaction, because most people have taboos about the profession of forensics. Therefore, Chiyo always felt hurt. Every day when she returns home, Chiyo basically spends her days with a beer in one hand and a TV remote in the other.

"Chiyo, oh hayo, how was last night's friendship?"

"Don't mention it, it's really ...... Not much fun."

"Don't be discouraged, you'll always meet a good man, come on Chiyo-chan!"

Chiyo met a female colleague who was also a forensic researcher in the locker room, but she didn't expect the other party to ask about last night's friendship again, which made Chiyo suffer a merciless blow again.

"Oh, by the way, Chiyo-chan! It looks like there's a package of yours on your desk......" another colleague reminded Chiyo as he walked in.

"Package, who sent it to me?" Chiyo felt very strange as she walked out of the dressing room and into her desk. Sure enough, I saw a delicate package. The shipping address for the package is Shimojo Village, Nagano Prefecture. Chiyo felt very strange, who sent it, and there was no one she knew who lived in this place!

After tearing open the outer packaging of the package, Chiyo saw a delicate gift box. The gift box is printed with the words "Nagano Famous Things", "Landscape Poems of Minami-Shinshu Winter", and "Ichida Persimmon". There is also a small envelope attached to the gift box.

Chiyo opened the envelope and realized that these Nagano specialties were sent by Lin Shuichi. In the letter, Hayashi said that he was now investigating something in Nagano Prefecture and wanted Chiyo to help him check the fingerprints of a certain suspect. The sample is the business card printed with the words of Kobo Saito, a professor of history and archaeology at Yamanashi University. The fingerprints that need to be compared are the unfinished case that occurred 10 years ago at Futu Temple in Yamanashi Prefecture.

"This Lin Xiuyi, he is not idle when he goes to 'training'!" Chiyo shook his head, for the sake of the gift, Chiyo still planned to help Lin Xiuyi with this.

Although it was an old case from ten years ago. However, the fingerprints left on the handle of the knife have long been entered into the police information database, and once a new suspect enters the fingerprints, the system will compare the fingerprints of these unsolved cases with the newly entered fingerprints, also thanks to the rapid development of science and technology.

Because the extraction medium for fingerprints is paper, it is most appropriate to use the ninhydrin reaction method in this case. The principle is that sweat contains a large number of amino acids, and ninhydrin can react with amino acids to form blue-purple substances under heating conditions and weak acid environments. This reaction is very Lin Min, when the ninhydrin reaction occurs, according to the blue-purple shade generated by the reaction, a spectrophotometer can be used to obtain a clear fingerprint at 570nm wavelength.

When Lin Xiuyi first received the business card, he deliberately noticed that Saito Gongwang pinched the two corners above the business card with the thumb and index finger of both hands and handed it over in a regular manner, and Lin Xiuyi also took it after pinching the two corners below the business card in a regular manner. If this business card had been clean before, Chiyo should have been able to extract 8 fingerprints from it. And the blood fingerprints left at the scene of the murder in Futu Temple happened to belong to the thumb.

If Lin Shuichi's guess is correct, the defenseless Professor Saito will be dead this time, because fingerprints don't lie. So far, if this case is considered as a motive of embezzlement, Professor Saito, who has gained fame and fortune, is definitely the biggest suspicious.

Chiyo successfully took 4 thumb and 4 index finger fingerprints from the business card, because Lin Xiuyi's fingerprints were recorded in the Metropolitan Police Department, and his fingerprints were immediately excluded. Chiyo then used the fingerprints of the remaining two thumbs to compare them with the bloody fingerprints left by the murder at Futu Temple ten years ago. Outcome......

……

After a shock, Lin Xiu turned over and got up from his seat one by one, and he picked up the mobile phone on the table. Seeing that it was sent by Chiyo, I couldn't wait to open the message.

"Ichida persimmons are delicious, but unfortunately the fingerprints don't match!"