After receiving the authorization and Liang Rui's approval, a vacant utility room on the first floor of Tianleiyuan's office building was cleared out overnight and the necessary tables, chairs, furniture, etc. were put in to serve as the investigation room for Jin Yan and the others.

All evidence, including cake remnants and all utensils and supplies in the canteen at that time, were carefully collected, put into evidence bags or evidence boxes, marked in order, and placed on evidence shelves.

superior.

Jin Yan and the other three were sorting out their belongings and utensils while chatting with each other about the situation.

"You mean, you thought the smell of this cake was wrong before?" Yang Xuexin asked.

Jin Yan then told what happened before.

"I have been a classmate for more than three years, but I can't tell that a fat guy like Wang Hai has such a sensitive nose." Yang Xuexin praised.

After being praised like this by her, Wang Hai rubbed the back of his head and giggled sheepishly.

"Xue Xin, Er Fatty and I realized something was wrong in advance, so we didn't eat much cake. How did you..." Jin Yan asked.

"Before I left, I prepared some medicines at home in case of emergencies. Among them was a bottle of powerful antidote, which is extracted from alienated medicinal plants and can neutralize the toxicity of hundreds of poisons. When things come to a close, I

I started using it without much thought, and felt that the detoxification effect was good, so I also used half of it for Teacher Lin." Yang Xuexin said happily.

"It's good to be rich," Jin Yan said, "How can ordinary people get such a bottle of antidote, which may be life-saving when needed urgently, or even if they lose all their money, they can't afford it!"

"Are you making fun of me?" Yang Xuexin asked with her head slightly tilted and a hint of anger.

You might have been kicked in the head by a donkey. Can you hear the sarcasm in a good sentence? Jin Yan thought.

At this time, the security captain Li Lu came in with a box and opened the box. There were three mobile hard drives inside.

"What is on the hard drive is a copy of the video recordings from various surveillance cameras in the kitchen and canteen the day before today's incident." He said, "We have watched it repeatedly, and no suspicious person has been found yet."

"Thank you for your hard work, Captain Li, please put it on the shelf first." Jin Yan said.

Li Lu put the box away, looking as uncomfortable as constipation. He felt that what happened tonight was a huge dereliction of duty on his part as the security captain.

"Jin Yan, now you are authorized by Captain Liang to investigate the matter. If you need me to do anything, don't be polite and just give me orders."

"Okay, please ask Captain Li to strengthen the security around you and adjust the camera angles to ensure the safety of this evidence room when we are not around. If someone intends to destroy and steal evidence, then even if he is not the murderer, he has a lot to do with the murderer.

The involvement!" Jin Yan said.

...

It was late at night, but Tianleiyuan was experiencing a sleepless night. The lights in the student dormitory were brightly lit, and the painful screams of students could be heard from time to time. The corridors were also filled with the hurried footsteps of medical staff and security guards.

Jin Yan wrote an investigation relationship diagram on a mobile blackboard in the investigation room.

The four words "Yuanqing No. 4" are written in the center of the relationship diagram. An arrow emanating from it points to "Fan Xitong" written on the right; an arrow emanating from it points to "Mingda Cake Shop" written on the left.

", and an arrow appeared in the lower left corner, pointing to the three words "Yang Keming", but there was a question mark on the right side of the words.

"It is clear that the toxin is the synthetic toxin Yuanqing No. 4. Putting aside the identity of the poisoner and the purpose of poisoning, we can have three guesses about the location of the poison." Jin Yan said, "The first is Mingda Cake in Leijiang City.

The second is the bus, and the third is the kitchen of Tianleiyuan. Let’s use the elimination method to calculate it first.”

As he spoke, he wrote the words Mingda Cake Shop, Bus, and Tianleiyuan Canteen on the right side of the blackboard.

"Currently, Mingda Cake Shop is the most suspected. But since we have not gone to the scene to see it, and have not asked anyone in the shop for a confession, we can only leave it alone for now."

"On the bus, there were forty-four teachers, students and drivers taking the bus back to Tianleiyuan from the city this evening. The cake trolley was carefully placed in a conspicuous position in the aisle. If anyone is interested during this period,

No matter how subtle his movements are, he will not be able to escape everyone's eyes." As he spoke, he made a cross on the word "bus".

"On the road from the cake shop to the bus, Yang Keming personally supervised it, and no one else came into close contact with the cake. Either Yang Keming himself was the poisoner, or the possibility of poisoning can be ruled out on this section of the road."

"The bus arrived at Tianleiyuan at about nine o'clock. The time when Cake got off the bus and went to the canteen was about 9:04 to 05. From getting off the bus to locking the door of the canteen and leaving, Erpang helped the whole process.

He and Yang Keming were the only ones who pushed the cake into the canteen, and there was no impression that anyone else was approaching or doing anything unusual. After putting it away, the second fat man felt uneasy and felt that the smell of the cake was not right, so he raised the issue with Yang Keming, but did not

Being taken seriously. The time they locked the door and left the cafeteria was around 9:07-08. So, after putting away their things, he came to me again. I went with him to find the captain, the captain and Sister Wen Yue.

Take us to find Yang Keming to open the door. At this time, it is probably around 9:20."

"If the poisoning happened in the cafeteria, then it would be between 9:07 and 9:20, which is about 13 minutes in between. If the murderer had a plan in advance and had been observing in secret, he would unlock the door immediately after they left and inject the poison

, there is still plenty of time in between.”

Jin Yan said and took out a list: "This is the list of canteen employees. Including Yang Keming and Er Pang, there are seven people in total. Because they get up early for breakfast, everyone has a key to the canteen. So.

, assuming that the place of poisoning was the canteen, these seven people are all suspects."

Wang Hai grimaced: "So, I still have suspicions."

"The problem now is that the cameras inside and outside the canteen didn't capture any abnormality. The camera outside the canteen was not aimed at the door of the canteen, and the camera inside the canteen was not aimed at the cake. After all, no one would have expected this situation in advance.

Adjust the camera angle. Just because there is no abnormality in the picture does not mean that there is no abnormality. If the murderer is an insider, it is not difficult to know the angles of each camera and avoid them."

Jin Yan pasted the list on the blackboard with double-sided tape. Then he took out a stack of paper and said, "This is a guarantee just written by five other canteen employees. They swore that they had not been to the canteen at night.

Because most of the students went out in the evening, they cooked less food and washed the dishes easily. They were done in a while. After locking the door and leaving, there were three people fighting in the room, while the other two were resting, and the other two were resting.

One is doing laundry. As for each other, they are not sure whether one of them could have completed the crime in a few minutes."

"After analyzing it, I still tend to have nothing to do with them. Because the matter of buying cakes was completely a spur-of-the-moment idea by Team Liang, and was not disclosed to Tianleiyuan in advance... The plan must be completed in a short time.

It’s not easy to be so seamless.”

"This is the final struggle, let's unite until tomorrow..." The ringtone of the mobile phone started. In order to facilitate the investigation of the case, Liang Rui returned the mobile phone to the three of them for the first time. It had just been fully charged.

Good electricity.

"Hello, Captain Liang." Jin Yan pressed the answer button and the caller was Liang Rui.

"Subordinates of the Tianlei Squad and the local Police Bureau have taken control of the Mingda Cake Shop and its owner." Liang Rui said, "I will take over here. You can go and send them to the Mingda Cake Shop in the city.
Chapter completed!