Xie Xuan looked at her steadily, and after looking at her for a long time, he said, "Luyang County can't be messed up." ”

"Why doesn't Luyang County ......" In the middle of his words, Chen Chaoyan stopped abruptly.

According to the equivalent exchange, the county guard is equivalent to the governor of a province. Serving in the military in front of the county guard is equivalent to the secretary of the provincial governor. Si Cang's participation in the army is equivalent to the director of the bureau in charge of education, medicine, etc. The judicial cangjun is equivalent to the director of the court and the police station. Although there was no imperial court establishment in this era, the two military histories and the work belonged to the section level.

A case that involves all the big people in a county really can't be acted rashly.

But...... Chen Chaoyan looked at Xie Xuan unwillingly, and insisted: "Luyang County can't be messed up, but the murderer can't be let go either!" ”

"It's just that you can't act rashly, not to let the murderer go." Xie Xuan said it lightly, but the power contained in his words was like a volcano, "Call a few of them over, and the method of asking them one by one can't be used, then let everyone in the county guard mansion explain their whereabouts last night, isn't it." ”

Chen Chaoyan nodded, "This can be had." ”

Xie Xuan chuckled twice, and after asking Chonglou to tell Feng Shoudao and let everyone explain his whereabouts, he looked back at her.

Chen Chaoyan pretended not to see it, and continued to bow his head to study the fingerprints on the deed.

After studying it a few times, she proposed to go to Zhou's house to scan the fingerprints at the scene of the crime.

Of course, Xie Xuan agreed to her without hesitation.

Night has fallen.

Xie Xuan didn't make any more fanfares, but took Chen Chaoyan to Zhou's house with a light car.

Mrs. Zhou was accompanying the two children to eat, and when she heard the news that the maidservant girl had come to Chen Chaoyan again, she immediately threw down the dishes and chopsticks and rushed out, "Miss Chen came here at this time, is it ......"

Chen Chaoyan avoided her expectant eyes and said, "Come over again to see if you can find clues." ”

Mrs. Zhou asked reluctantly, "Miss Chen hasn't dissected the body yet, has she?" ”

Inevitably startled, although cruel, Chen Chaoyan still said ruthlessly: "I'm sorry." ”

As soon as Mrs. Zhou's body weakened, she fell into her mother-in-law's arms. Tears rolled down like beads of broken thread.

Chen Chaoyan wanted to comfort, but when the words came to his mouth, he didn't know how to speak.

"My father-in-law has never borrowed money from the cabinet, and he will never commit suicide!" Mrs. Zhou closed her eyes and said with grief, "Miss Chen, let's go, the concubine will not accompany you." ”

Chen Chaoyan bowed his head apologetically to her, and then motioned for Yuejian to push her away.

Guarding the study were a few officials, and Wang Da was not there. Chen Chaoyan just wanted to guard the study, as for who would guard it, she didn't care, so she didn't ask more. When several officials were sincerely apprehensive to Xie Xuan, Chen Chaoyan, who was stimulated by Mrs. Zhou's grief, directly passed them and entered the study first.

After habitually glancing around, and making sure that it was still the same as when she came in the morning, Chen Chaoyan asked Yuejian to push her to the lacquered wood coffee table.

The lacquered wood coffee table and bookcase are all made of red lacquer.

Chen Chaoyan first observed carefully for a moment, and then took a few breaths in the place where there might be fingerprints, and after failing to see the fingerprints, she dipped the pot ash with a pen and gently shook it onto the coffee table in the same way as scanning the fingerprints on the loan deed.

The coffee table is big, and the pen is too small.

After shaking for a long time, I only finished shaking a corner.

This is going to be shaken all over and brushed out again, I don't know when it will be, and there is a bigger bookcase waiting for it. Chen Chaoyan raised his eyes to look at the bookshelf not far away, and called Yuejian, "Bring me that feather duster." ”

Of course, Chen Chaoyan knows that fingerprints should be brushed with a soft brush, so as not to destroy the fingerprints. But she is a layman by brushing her fingerprints, so she doesn't care about those details.

Dip the feather duster in the pot ash, gently shake it on the coffee table a few times, and after covering the thin layer of pot ash, she pressed the direction from left to right, put light force, and swept it up little by little.

The whole process took half a cup of tea.

But the result is ...... Nothing.

Chen Chaoyan didn't give up, and re-swept it with flour and powder, but there was still nothing.

The same is true for bookcases.

Chen Chaoyan twisted his eyebrows and looked at the feather duster, pot ash, flour and powder, carefully considering the possibility of using a brush to do it all over again.

Next to her, Xie Xuan glanced at her a few times, and after making sure that she was not discouraged, he looked at the bookcase and asked, "Is there no fingerprints, or can't you scan the fingerprints?" ”

"Can't sweep it out." Chen Chaoyan said.

"Why can't you sweep it out?" Xie Xuan looked back at her.

Because the method is wrong.

Fingerprints left at crime scenes are generally classified into distinct lines, molded lines and latent lines. Visible wrinkles can be observed with just eyes, gas, magnifying glass, or ultraviolet light. For forming patterns and latent patterns, they can only be observed and extracted with the help of physical or chemical methods.

The physical method is very simple, it is the powder method she uses to brush her fingerprints.

For chemical methods, iodine fumigation, Ningheidelin, silver nitrate or fluorescent reagents are used.

Chemistry, she can't help it.

But the physical law ......

Chen Chaoyan lifted the feather duster, and then used his jaw to nod a little pot ash, flour and powder, and said, "Probably the feather duster is not soft enough and the adsorption capacity of these powders is not good." ”

Without waiting for him to ask, she continued: "The powder used for fingerprinting is generally copper, iron and magnetic powder. The brush should use stork feathers, goose feathers, gray squirrel feathers and other softer hairs. ”

Tsukimi looked at the feather duster, then at the pot ash, flour and powder, and finally at her, "So what now?" ”

Chen Chaoyan said: "Go back." ”

Yuejian looked at Xie Xuan.

Xie Xuan raised his eyebrows, "It's time for dinner." ”

When he came out of Qiwan Lane and got into a carriage and walked to the county guard's mansion, Wang Dacai, who got the news, hurried to Zhou's house.

Several officials have been guarding the door, and they don't know what Chen Chaoyan is doing in the study. Wang Da couldn't get the news they wanted from their mouths, and when he entered the study, he saw all kinds of powders scattered under the coffee table and the bookcase, and after his heart sank, he quickly found Mrs. Zhou, and asked with a threat: "What is Miss Chen doing at Zhou's house, it is related to the investigation of Zhou Zhongcai's case, and I hope that Mrs. can tell the truth!" ”

Mrs. Zhou, who finally dried her tears, couldn't help but wet her eyes again when she heard this. After wiping away her tears with a handkerchief and whispering to comfort her overwhelmed father, she held back her bitterness and repeated to him what Chen Chaoyan said after she came.

After hearing this, Wang Da's heart sank more and more, but he continued to ask without revealing his face: "Miss Chen didn't say what clues she came to find?" ”

Mrs. Zhou shook her head: "Miss Chen just said come and see if she can find some more clues." The concubine didn't follow, what clues she was looking for, and what clues she found, the concubine didn't know. ”

Wang Da couldn't help but scold the idiot, so frightened that Mrs. Zhou fell backwards and sat back in the chair, and also scared Mrs. Zhou's father and mother trembling. Mrs. Zhou's younger brother wanted to stand up and protect them, but they secretly pulled him back.

Wang Da, who had everything in his eyes, hurriedly suppressed his anger and waved his hands to apologize: "The King of Jin came to Luyang County to have fun, and no one knows when he will leave." Although Miss Chen is good at solving the case, she is the person of King Jin. When King Jin leaves, she will inevitably follow. As soon as she leaves, it is unpredictable whether this case can be solved. I was also too anxious, and there was a lot of offense between my words, and I hope that my wife can forgive. ”

Mrs. Zhou was shocked by the news that Chen Chaoyan would leave with Xie Xuan at any time, and she forgot to continue crying for a while. After Wang Da apologized again, she woke up and said in a panic: "The concubine, the concubine, didn't know that Miss Chen would leave at any time. ”

"I just got this news." Wang Da saw that he stabilized her, and immediately made a request, "Madame has always said that Zhou Zhongcai was murdered, although there are no clues to prove it now, but in order to avoid that after Miss Chen leaves, the case will hang and cannot continue, and please remember that Miss Chen will come to Zhou's house in the future, no matter what she does, Madame must follow her closely and keep her words and deeds firmly in mind in case of emergency." ”

Mrs. Zhou hurriedly responded.

"Then I won't disturb Madame's rest." After Wang Da waved his hand again, he turned around and left.

When he walked to the door, he stopped again, turned around, and carefully instructed: "In order to avoid misunderstanding by Miss Chen, please also ask Madame to keep what I said and not spread it." ”

As he spoke, he deliberately glanced at her father and brother.

Mrs. Zhou obeyed his words, and after also glancing at her father and younger brother, she admitted: "But please rest assured, the concubine will be tight-lipped." ”

"Then there's Mrs. Law." After Wang Dawei bowed his head, he returned to the study again. After pondering the scattered pot ashes, flour and powder ash for a while, he left Zhou's house and hurried to the county guard's mansion.