Tan Yi walked up to her and said, "We learned about some people's situations, last night's shift situation, and the financial situation of the machinery factory."

Xie Qing said "Oh" and stopped talking, continuing to observe the office.

Cao Lushi's desk was next to the window, and there were two gray curtains on the window. Because they were sloppily drawn, one side was longer than the other.

If she was the murderer, she would never stand at the door to threaten the deceased. She would definitely be close to the desk and would definitely draw the curtains for the sake of caution.

Thinking of this, Xie Qing asked, "Was it a colleague from the branch who pulled open the curtain?"

Fu Da said, "Yes, I asked about this. If the deceased had just written a letter of resignation and completed his work, he would not have pulled the curtain, but it is not necessarily the case for suicide. The murderer would be more careful. However, it is hard to say. People are very different, and not everything conforms to general logic."

Tan Yi walked to Cao Lushi's desk and said, "Our country has strict control over guns. If the murderer wanted to force the deceased to surrender, he would at least have to walk to this position with the muzzle of the gun against the deceased's head. Only in this way can there be a sense of reality and intimidation."

"If the murderer is a stranger, Cao Lushi would shout and resist, and there are security guards and on-duty personnel in the building, so they would not fail to hear him. So, is the murderer an acquaintance of the deceased?"

Just when Xie Qing thought he had raised a question and was waiting for her and Fu Da to answer, he gave the answer himself, "Generally speaking, yes, they are acquaintances. Cao Lushi didn't want anyone to see him with this person, so he carefully pulled the curtains. Of course, it is not ruled out that the deceased liked to be with him. "I like to draw the curtains. We can ask the patrol security guards about this."

Fu Da said, "If it was done by an acquaintance, everyone on duty last night is a suspect, including the security guard, the office director, the gatekeeper Lao Li, the production team leader on the production line, the workers, and the factory manager Chen Zhicheng who was still in the office around 7pm. Of course, it is not ruled out that a killer jumped over the wall, and the scope would be much larger."

Xie Qing smiled, "Brother Fu is just talking nonsense."

"Haha~" Fu Da laughed, "You use the word 'loneliness' very cleverly, but there is one thing in the end, the people who were in the factory at the time are more suspicious."

Xie Qing said, "Captain Tan, Brother Fu, the buttons on the collar of the deceased are slightly loose, and the soles of his leather shoes seem to have been rubbed. I can't figure out why. Uh... or, should I send the shoes to the technical room for testing?"

Tan Yi nodded, "Let's wait for the test results from the technical room first."

Fu Da said, "If the test results also show that the deceased did die of suicide, should we continue to investigate?"

Tan Yi said, "We will withdraw temporarily. Please ask the Economic Investigation Detachment to investigate the financial situation of the machinery factory."

The three of them acted independently and walked around the room.

Xie Qing found that the sanitation in the office was indeed very good, with almost no dead corners.

Although it was the weekend, there was clean water in the basin behind the door, and the rag was made of old clothes and was very clean.

There were no traces left by the murderer in the office, nor any signs of resistance from the deceased, so they just took a look and left together.

Xie Qing turned right after going out the door, and just as she was about to say "I'm going to the bathroom" she saw Tan Yi coming in the same direction as her.

Fu Da's reaction was not slow either, "Are we going to the bathroom?"

"Yes." Tan Yi strode ahead.

The bathroom was very simple, with two channel-shaped pits, a half-person-high wooden cubicle, running water, and very average sanitary conditions.

On one side of the wall outside the toilet, four mops were hung upside down. They were pitch black and very dirty.

Xie Qing put on gloves and compared their wetness. One of them was very wet, and the water content was obviously different from the other three.

She leaned forward and smelled it. In addition to the unique moldy and rotten smell of mops, there was also a foul smell.

She said, "Could it be that the deceased stepped on shit?"

Fu Da also smelled it and exclaimed, "Fuck!" "It smells like shit. Although it's disgusting, this explanation can explain the problem."

Tan Yi squatted down to check each toilet one by one, and found a clue in the third toilet.

He took a look and looked away, "It should be here."

Xie Qing raised her eyebrows and thought to herself that she thought it was a clue, but it turned out to be an oolong. Fortunately, Han Feng did not mention this at the meeting.

The three of them went downstairs and took a walk around the machinery factory.

The walls were not high, so getting in and out was not a problem for any man with a little physical strength.

Outside the east and west walls was a residential area, and under the walls was a cement street. The walls were clean and there was nothing suspicious.

There was a stinky ditch outside the north wall, which made it relatively hidden from entering and exiting the machinery factory.

The security guard accompanying them introduced, "Captain Tan, a thief broke into our factory a few years ago, and he broke through the north wall. It's indeed not very safe here, but our captain has arranged a fixed patrol time, and it has been very peaceful recently."

Tan Yi glanced at the top of the wall.

Fu Da understood what he meant, "Do you want to go out and take a look?"

Tan Yi said, "Although it's unlikely, it's better to take a look."

"Okay." Fu Da started running, jumped, climbed up the wall with both hands, and flipped over in less than three seconds.

Tan Yi asked the security guard, "When Cao Lushi works overtime, will the office hang curtains?"

"He rarely works overtime, but other accountants do work overtime. I haven't paid much attention to this issue, so I'm asking." The security guard turned on the intercom and asked another security guard, "Da Qiang, if the Finance Department works overtime, will they hang curtains?"

The voice of another security guard came from the intercom, "It seems that no one hangs curtains. Anyway, I haven't seen any office with curtains."

Tan Yi thanked the security guard and asked him not to follow him. He went east with Xie Qing to check the north wall.

It was a rare opportunity for them to walk side by side in such a quiet and peaceful way. He felt an indescribable satisfaction and peace in his heart.

Tan Yi asked Xie Qing, "Xiao Xie, what do you think? Was it suicide or was it murdered by him?"

Xie Qing was stimulated by the shit on the sole of his shoe and said conservatively, "My blind guess is that he was murdered."

Tan Yi found a dry mud mark on the wall, "I still think the deceased was murdered by him."

Xie Qing said, "There is no evidence at the moment."

Tan Yi broke off a willow branch and poked the mud mark - it was already dry and dust was falling down.

"It should have nothing to do with this case," he said. "If there is no evidence, we will find evidence."

Under the wall was a brick floor, washed several times by the spring rain. There were no fresh footprints, so it could be inferred that there would be no

fresh footprints outside the wall. Five or six minutes later, Fu Da came back. As expected, he found nothing except a few old footprints.

He glanced at his watch, "It seems that we can't find anything. It's past one o'clock. Let's find a place to eat."

Most restaurants are closed at this time.

Xie Qing said, "Let's go eat burgers. It's convenient and fast."

Fu Da smiled and said, "Okay, I took my children there once."

Tan Yi didn't object.

The three of them took two cars to Daken Grandpa. Tan Yi treated them and ordered three sets of meals, a box of grilled wings, and three sundaes.

Xie Qing wanted a chocolate sundae, with a rich chocolate flavor, dense and smooth cream, and a deep icy feeling. Every bite was a pleasure.

Fu Da ate it in a few big mouthfuls and smiled, "This thing is better than ice cream."

Tan Yi said, "It's okay to eat occasionally." He didn't like sweets very much, so he bought it just to taste it.

Xie Qing said, "Some people say that eating too much sugar will age faster, so it's better to eat less."

Fu Da was surprised and asked, "Is it true?"

Xie Qing pushed the sundae cup aside, "I don't know whether it's true or not, but compared to foreigners, Chinese people are much younger than their peers."

Tan Yi looked at his face in the bright brass decoration, and then looked at Xie Qing's, and suddenly felt a little bit of crisis - he was younger than his peers, but much older than Xie Qing, especially wearing these black-framed glasses.

Grandpa Ken's fried chicken was not spicy enough, but it tasted good.

The three of them finished their lunch happily and returned to the Municipal Bureau.

As soon as he got out of the car, Tan Yi received a call from the technical room - the concentration of Valium reached the lethal dose, but considering the weight of the deceased, the deceased should not have died at three o'clock, but later.

After hanging up the phone, he said to Xie Qing: "The time of death does not match the drug concentration. It seems that we have to re-examine the autopsy."

Xie Qing said: "I will call Han Feng and go to the funeral home immediately."

Tan Yi said to Fu Da: "You immediately organize people to investigate the source of the drugs and conduct further investigations on all those who stayed in the factory during the incident. I will notify the investigation team."

The two of them walked quickly towards the office building while talking.

Xie Qing called Han Feng, started the jeep, and returned to the funeral home.

She took the body out of the freezer and put it on the dissection table when Han Feng arrived.

He put on his white coat and said, "If poisoning is not the direct cause of death, then it must be suffocation. This is really confusing. We can't find direct evidence."

Xie Qing said, "Let's look for it again. We don't seek credit, but we don't seek fault."

Han Feng asked, "Xiao Xie, do you have any ideas?"

Xie Qing took out a plastic bag from her pocket and said, "The mouth and nose are not deformed or bruised. The probability of suffocation is higher. Let's check the upper respiratory tract."

Han Feng complained but he was still very serious at work. He opened the upper respiratory tract of the deceased without complaint.

Xie Qing used a magnifying glass to check bit by bit. After three minutes, she found a long and thick fiber in the nasopharynx.

She used tweezers to pick it out and put it in a glass container. "It seems that he killed her without a doubt."

Han Feng let out a long sigh. "That's great. He didn't die in vain in our hands. Now it's their job."

The two signed the autopsy report, handled the body, and returned to the Municipal Bureau.

At five o'clock in the afternoon, the technical room gave a report, confirming that it was a piece of old cotton fiber.

This reminded Xie Qing of the rag next to the basin in the Finance Department - the rag was cut from old clothes, but it was obvious that it had not been used to wipe dirty things, so it should be newly brought in.

She didn't have time to think about it, and went to the machinery factory for the third time and brought back the old rag.

At seven o'clock in the evening, the technical room confirmed that the fiber was once part of the old rag.

So, who was the owner of the rag, where did he put the plastic bag, and why was the murderer able to find it?

Fu Da immediately sent someone out and asked them to invite all the office members back immediately.