When Shen Zezhi and Ji Ziyue returned to the office, it was already the second half of the night, and it happened that Sang Yunqing's autopsy report also came out.

"Did you find anything?" Shen Zezhi picked up the water on the table and took a sip.

Sang Yunqing pinched the bridge of his nose tiredly: "It's a big discovery." I detected the same substance in Xiao Jian and Chang Yuwen - ketamine. ”

"K powder?" Kiko asked in surprise.

Sang Yunqing nodded and said, "According to the very little medicine left in their bodies, it can be determined that it was taken orally." The main ingredient of K powder is ketamine. Ketamine can produce a dissociative anesthetic state characterized by rigidity, shallow sedation, amnesia, and significant analgesia, as well as access to dreams and hallucinations. ”

Shen Zezhi said: "Do you think they hallucinated on the roof of the building after taking drugs and then fell down?" ”

Sang Yunqing picked it up and put down the report: "I don't know, I'm just a forensic doctor." Here are the test results. ”

Ji Ziyue turned his head and asked Shen Zezhi: "Xiao Jian and Chang Yuwen take drugs?" ”

"We're going to check Xiao Jian and Chang Yuwen again." Shen Ze's way.

Sang Yunqing has been busy in Chongqing City from Chongqing City to now, she packed up her things and went to rest. Shen Zezhi and Ji Ziyue spent the night in the office, and they couldn't sleep anyway.

Early the next morning, Shen Zezhi and Ji Ziyue found Xiao Jian and Chang Yuwen's counselors.

"Drugs?" The counselor was a young man who had graduated a few years ago, and he was surprised to hear Shen Zezhi's words.

Shen Zezhi asked, "Is there anything wrong with Xiao Jian and Chang Yuwen?" ”

The counselor shook his head: "Don't say anything else, Xiao Jian and Chang Yuwen will definitely not take drugs." They never go to nightclubs, at most they go to KTV to sing. No exposure to drugs. ”

Noriko asked, "Is it possible that anyone in their dormitory has access to this kind of thing?" ”

The counselor shook his head: "Impossible. ”

Shen Zezhi stood up and said, "Thank you." ”

The counselor sent them out: "It's okay. ”

Leaving the instructor's office, Ji Ziyue said: "Guan Xin checked the accounts of Xiao Jian and Chang Yuwen, and their account withdrawal records did not show any abnormality. It seems that they really don't take drugs. ”

"Let's go to their dorm room again." Shen Ze's way.

After Shen Zezhi and the others arrived at the dormitory, Lin Yunzhi and Guo Dahong were there, and the two of them were a little nervous when they saw Shen Zezhi and Ji Ziyue.

"Don't be nervous, we're just here to find out a little bit about the situation?" Noriko reassured the two of them.

Lin Yunzhi asked, "What else do you want to ask?" ”

Shen Zezhi looked at their dormitory, he picked up Xiao Jian's cup, and it was clean. Shen Zezhi asked, "You helped Xiao Jian wash the cup?" ”

Lin Yunzhi shook his head: "No, his cup has always been like that, he never drinks the water in the dormitory, only drinks." The cup has not been used since it was bought. ”

Shen Zezhi picked up Chang Yuwen's cup again and looked at it, and there was a little water left in it. Shen Zezhi tightened the lid of the cup and handed it to Ji Ziyue, who used the evidence bag to pack him up.

Shen Zezhi turned around, pointed to the garbage basket in their dormitory and asked, "Do you still use paper cups?" ”

Guo Dahong glanced at it: "Oh, this." Sometimes we would drink some wine in the dormitory, and we would buy paper cups. ”

At this time, someone knocked on the door of their dormitory, and Lin Yunzhi went over to open the door. The people outside were a little surprised when they saw Shen Zezhi and Ji Zi.

Kiko smiled and said, "It's you." ”

Lin Yunzhi looked at them and asked, "Feng Keli, do you know each other?" ”

The person who came to knock on the door was Feng Keli, who took Shen Zezhiji and Ziyue to bypass the reporter that day.

"Ah, we know, Officer Shen, Officer Ji." Feng Keli laughed, a cute little dimple on his cheek.

Shen Zezhi smiled: "Do you know our names?" "They didn't introduce themselves that day.

Feng Keli explained: "I am the secretary of the counselor's office. ”

Lin Yunzhi asked, "Is there something wrong?" ”

Feng Keli looked at him and said, "The counselor asked you to go to his office." ”

Lin Yunzhi said: "Okay, I'll go right away."

Feng Keli stood at the door and said, "It just so happens that I'm going over too, let's go together?" ”

Lin Yunzhi turned his head to look at Shen Zezhi and Ji Ziyue, Shen Zezhi said: "It's okay, you go first." ”

Lin Yunzhi and Feng Keli left together.

Shen Zezhi asked Guo Dahong, who stayed in the dormitory: "You are very familiar with Feng Keli?" ”

Guo Dahong nodded: "Their dormitory is also on this floor, and it is the guide's office, so I have a lot of contact." Feng Keli is very enthusiastic, and he has a good relationship with people at this level. ”

On one side, Ji Ziyue was wearing gloves to rummage through Xiao Jian and Chang Yuwen's garbage baskets. But there was nothing in their garbage baskets, just a few paper balls.

Noriko took off her gloves and asked, "Did you help them take out the trash?" ”

Guo Dahong shook his head: "No." ”

Ji Ziyue and Shen Zezhi glanced at each other, Xiao Jian and Chang Yuwen also took out the garbage before jumping off the building?

A few minutes later, Shen Zezhi and Ji Ziyue left the dormitory. When he went downstairs, Kiko sighed: "There is no clue." ”

Shen Zezhi looked at the dormitory administrator in the duty room on the first floor: "Not necessarily. ”

"You ask 404?" The dormitory manager was an old man in his fifties and sixties. He thought for a while and said, "They are in the same class, so the relationship is okay." But it's not as good as it was in freshman year. The relationship between the four of them in the freshman year is good, and they go in and out together every day. Not in the second semester of sophomore year, the youngest in their dormitory had a fight with the young man from the northeast. Alas! I don't know why. ”

The youngest is Xiao Jian, and the one from the northeast is Chang Yuwen. Fight? According to Lin Yunzhi, they have a good relationship, if the relationship is good in the freshman year, then what happened in the sophomore year made Xiao Jian and Chang Yuwen fight.

As he left the apartment building, Guan Xin called.

"Team leader, what you asked me to check has been found. The 405 suicide case in the library of Chengnan University was famous in those years. It's a bit strange to talk about. This case happened ten years ago, the deceased woman, whose name was Chen Cheng, also graduated from Chengnan University, and had only been working for a month at the time of her death. According to the transcript in the case file, she worked overtime in the library the first night, and the next day others came to work, knocked on the door of her office and couldn't knock open, and then found a spare key in the logistics office to open the door, and found that she had committed suicide in the office. By the way, there are also photos of the scene of the death. I'll send it to you. ”

"I went on to say that because the room was completely closed at the time of the deceased's death, the windows and doors were locked from the inside, and it was on the fourth floor, and there was nothing to climb from the outside, so it was ultimately determined to be a suicide." Guan Xin Road.

After hearing this, Ji Ziyue couldn't help but say, "So it's considered suicide?" ”

Shen Zezhi hung up the phone: "Ten years ago was not as good as now." ”

He used his mobile phone to open the photo that Guan Xin sent him, the photo was taken by the police of the Physical Evidence Department who went to the police at that time, and from the photo, Chen Cheng hung himself on a chandelier with a piece of rope, stepped on the stool and kicked off the stool and hanged himself. Is there any connection between the suicide of the administrator ten years ago and the suicide of a student by jumping off a building ten years later?

Shen Zezhi's mobile phone rang, he picked it up and said a few words, and then hung up the phone.

"The librarian said she helped us request a key to the fourth floor and we were able to go in." Shen Zezhi turned his head to Ji Ziyue and said.

After arriving at the library, it was the female administrator who received them yesterday, and he walked up with two people, and said as he went, "I haven't been in that room for a few years." I've heard about this since I was in school. ”

The administrator opened the door, and Shen Zezhi and Ji Ziyue went in to check on themselves as if they were here for the first time. When he came out, Kiko looked at the administrator standing at the door and said casually, "Aren't you going in and having a look?" ”

The administrator hurriedly shook his hand: "No, no. ”

Shen Zezhi glanced at the work card on her chest: "Your surname is Chen?" ”

The administrator smiled and said, "Yes, my name is Chen Ya, you can call me Xiao Chen." ”

In the dormitory, Guo Dahong walked around the dormitory.

"Don't go, I'm dizzy." Lin Yunzhi frowned.

Guo Dahong walked up to Lin Yunzhi and said, "They will definitely find out, that incident won't be hidden for long." ”

"If you can't hide it, you can't hide it, that incident was not our fault in the first place." Lin Yunzhi picked up the cigarette case, took out a cigarette, lit the cigarette, and took a puff.

Guo Dahong grabbed his hair with both hands and collapsed: "It's not our fault, you still think so?" Xiao Jian and Chang Yuwen are dead. And、Still dead in that place。 It was he who came back to us for revenge. ”

"Shut up!" Lin Yunzhi let out a loud shout, and his fingers holding the cigarette trembled slightly. "Don't talk about that again."

Outside the door, a person happened to walk outside the door of their dormitory, and when he heard Lin Yunzhi's voice, he slightly hooked the corners of his lips.

It is impossible for Xiao Jian and Chang Yuwen to take drugs, and now the possibility of their suicide can basically be ruled out.

So, who killed them?

Where does ketamine come from in their bodies?

Who is targeting a few college students?

What is the secret that Lin Yunzhi and Guo Dahong are trying to hide?

Is there a connection between the suicide case of 10 years ago and the current case?

None of these questions can be answered right now. The only thing that is certain is that the deaths of Xiao Jian and Chang Yuwen were murders. If the two of them were murdered because of a secret they shared in their dormitory, Lin Yunzhi and Guo Dahong would also be in danger. When will the murderer do it? Now that the library building has been sent to keep an eye on it, Lin Yunzhi and their dormitory have also been controlled. It shouldn't be too easy for the murderer to get his hands on it.

In the afternoon, Qi Kai and Zhao Jiyong came back, and they brought back the detailed information of the four people in the 405 dormitory, as well as a little bit about them from their classmates and teachers.

"From the description of their classmates, it can be seen that the four of them have a good relationship in the dormitory. The eldest in it is Lin Yunzhi, who is the head of the house, and has always been in a leading position. Xiao Jian is the youngest and the least courageous, Chang Yuwen is very arrogant, Guo Dahong has no opinions, and basically belongs to the people like the grass on the wall. They organized a club in their sophomore year, and that's when things happened. ”

Qi Kai handed over a few pieces of paper to Shen Zezhi. “mi？” Shen Zezhi raised his eyebrows.

"They're fans of the Mystery Detective Agency." Noriko crosses the road.

Guan Xin looked up at him: "You also watch the Mysterious Detective Agency?" ”

Ji Ziyue nodded, a little embarrassed and said, "Yes, the mysterious detective agency was very popular during that time, and everyone was chasing it." ”

Qi Kai interjected: "What is the Mysterious Detective Agency? ”

"Oh, it's anime. Detective reasoning has been popular on the Internet for a while. The detective agency in the anime is called mi. Kiko-more explained.