The staff of the library had a very uniform evaluation of Chang Lao, and when they heard the news of Chang Lao's suicide, they were all shocked/shocked, and they all felt that it was impossible for Chang Kunbing to kill himself, and someone must have murdered him.

After a while, all the staff of the library arrived, waiting for the detective's questioning.

Several little girls were so frightened that they almost cried, they didn't expect such a thing to happen.

The communication room in front of the library is full of people every day, and they are on duty in shifts and do not leave work. Yesterday there was a young man in his thirties on duty in the communication room. According to him, after getting off work last night, he didn't see anyone entering through the main entrance. He didn't doze off at night, and no one had ever gone in. Not a single suspicious character was found, and I really don't know who would do such a ruthless move.

The last person to leave the library staff office yesterday was an intern in her early twenties, a girl who hadn't graduated from college yet.

The girl told them that she had not left the library until about ten o'clock last night. Because she was in her senior year and was about to graduate, she was preparing her graduation thesis in advance, and after work, she found some materials in the library and planned to take them back to continue reading.

It took her a lot of time to find the information, and after all the information was found, she went back to the staff break room to get her things and prepare to go home.

"When I went back to the staff lounge, there were no locked doors and no one inside," the girl said. But I think Chang Lao may not have left. ”

Although the girl has not been here for a long time, and only helped here at the beginning of the second half of her junior year, she is careful to observe. According to the girl's observation, Chang Lao likes to use a glass jar to make tea, and he has to make tea every day. That glass jar should be a glass bottle of canned fruit in the supermarket, and Chang Lao has always used that.

The glass jar was a little yellowed by the tea, but Chang Lao seemed to like this cup very much and used it every day.

And the girl also said that every day before Chang Lao left, he would definitely pour out all the tea and tea leaves left in it, and clean up the cup before leaving.

But when she came back to get her things, she saw that there was an old glass jar on the table, with tea leaves and a bottom of tea, which had not been cleaned as usual.

The girl didn't care, thinking that maybe she had forgotten about it. When she left the library, it was about ten o'clock, and she glanced at the time on her hand/in-flight as she walked out because she was going to catch a car.

The girl was sure that she didn't lock the office door when she went out, just closed it gently, and then she left. When she left, the girl didn't meet any strange people, but saw that the light in the communication room at the door was still on.

After questioning the library staff, they took the collected evidence and the body back to the police station.

The corpse in this case was in charge of Yang Fa/Yi, but Tang Xin wanted to help, but Yang Fa/Yi didn't say a word of refusal.

Tang Xin said a word to Xie Jibai, and then followed Yang Fa/Doctor to conduct an autopsy first.

Xie Jibai and Bi Chengyuan had something else to do, and that was to check the library's surveillance footage.

There are surveillance footage in the library, but it's all outside, mainly at the entrance, and around the bookshelves. Although there is a surveillance video on the side of the employee's office, it has not been opened for a long time.

The staff of the library said that the monitor should have been broken more than a year ago and had not been opened again, and no one expected that something would happen, so they didn't care at all.

Xie Jibai and Bi Chengyuan checked the surveillance video, and after the library closed, the last employee girl left the library, and no one came in at the gate after that.

The surveillance at the gate can just shoot the communication room, and the lights in the communication room are always on, and you can see that the young man inside is always there. He went to the bathroom once, about two o'clock. However, I didn't go to the bathroom in the library, but the public toilet next to it.

The bathroom of the library is on the second floor, you need to climb upstairs, there are black/holes/holes inside, and you have to turn on the lights, which is very troublesome. So the young man told them that people who work in the communication room usually choose to go to the public toilet outside to solve the problem. The public toilet is just across the road, very close, it doesn't take five minutes to make a round trip, and it is much closer than the toilet on the second floor.

When the young man went to the toilet, there was no one in the communication room, but the surveillance did not capture anyone sneaking into the communication room at this time.

The surveillance inside also did not capture anyone moving around at all.

Xie Jibai rubbed his eyes, he stared at the screen for a long time, his eyes felt very sour, and he didn't find any useful clues.

Bi Chengyuan said: "Let's rest for a while." ”

Xie Jibai nodded.

Tang Xin didn't come back at lunch, so Xie Jibai had to solve it in the cafeteria. To be honest, the food in the cafeteria is really not as delicious as Tang Xin's cooking, and there are a lot of shredded carrots and shredded red peppers, which Xie Jibai doesn't eat at all.

Xie Jibai had no appetite, and when he saw a bunch of little red silk, he didn't want to eat even more.

Halfway through the meal, Chen Wanting called/called Xie Jibai's hand/machine.

Chen Wanting didn't know about the case yet, so he just asked Xie Jibai and Tang Xin if they would come back for dinner at noon, saying that Su Banyu had done a lot and could let them come here to eat.

Xie Jibai told Chen Wanting that in the police investigation bureau, Chen Wanting was startled, and then he knew that there was another case.

After lunch, Xie Jibai and Bi Chengyuan started working again. The police detective who went to Chang Kunbing's house also came back and reported the situation to Bi Chengyuan.

There are almost no people in Chang Lao's family, he was married in his early years, but his wife died and he had no children, so he lived alone. There are indeed some relatives, but the relatives have long since stopped moving, and none of them are in City C.

Chang Lao lives alone, not far from the library, it is a very old slab building, and he lives in a single room in the ground/basement.

They went to Chang Lao's house and asked Chang Lao's neighbors.

The neighbors heard that Chang Lao killed himself/, and it was also very strange, and they all said it was unbelievable. Chang Lao has lived here for decades, and he is familiar with the neighbors, and they all say that he is a very good person.

The neighbor said that Chang Lao had no children, so no one came to see him during the New Year's holidays, and his door was always very quiet.

Some people say that yesterday afternoon, Chang Lao came back for a trip, about five o'clock in the afternoon.

The neighbor's aunt picked up the children from the after-school class and went home, and when she entered the door of the building, she happened to see a courier brother going to the ground/basement and knocking on the door of Chang Lao's house.

When they went up to the second floor, they heard the voice of the courier brother, and it should be Chang Lao who came to open the door.

Xie Jibai said: "Yesterday afternoon, Chang Lao returned home from the library and received a courier? ”

Bi Chengyuan said: "It shouldn't be a courier. ”

Xie Jibai said: "That's? ”

Bi Chengyuan said: "It may be that a courier was sent. ”

The detective who came back to report said that Chang Lao should have been sending mail at that time, and the neighbor heard the courier brother ask Chang Lao if the courier he wanted to send was from the city.

Xie Jibai said: "We should check/check the courier. ”

Bi Chengyuan nodded.

Bi Chengyuan asked people to check the courier that was sent, and asked the library staff by the way.

The staff said that Chang Lao did leave for a while yesterday afternoon and didn't know where he went. However, Chang Lao had already retired and came back to help, so his working hours were very free, and everyone usually didn't ask about it, so he didn't take it seriously.

The express delivery is easier to check, and it was quickly found out, at about five o'clock yesterday afternoon, Chang Lao was really at home, and sent a courier in the same city.

The courier brother described the appearance of the old man who sent the mail, which was almost exactly the same as Chang Lao, and there was not much difference.

The courier brother inquired about this courier for them, because it was in the same city, so it was already shown that the receipt was successful.

There is no telephone/phone for the express delivery, only the address, but fortunately, it was successfully delivered, otherwise this piece would have been returned.

Bi Chengyuan continued to ask the courier brother what the recipient's address was.

At this time, Xie Jibai's mobile phone suddenly rang, and it was a call/call from Chen Wanting.

Xie Jibai took his hand/machine to the side to answer the call/call, and Chen Wanting said: "Xiaobai, there is a courier for you." ”

"Courier?" Xie Jibai was stunned, because they were still investigating/checking the express delivery just now, so when he heard these two words, he was a little sensitive.

Chen Wanting said: "Yes, my mother just called me, saying that I heard someone knocking on the door outside just now, and when I opened the door, I saw that it was a courier brother, but I was not knocking on their door, but knocking on the next door." My mom asked him who he was looking for, and he said there was a courier from Mr. Xie. ”

Xie Jibai was even more stunned.

Xie Jibai used to live next door to Chen Wanting's house, and they were neighbors. However, because of the death of his parents, he has already moved out, and the new residents are not surnamed Xie.

Chen Wanting said: "When my mother saw the name, it turned out to be a courier sent to your father, so she signed for it, and just called me and asked me to go over." ”

Xie Jibai was even more confused, his father had passed away a long time ago, after so many years, how could someone suddenly send a courier.

Xie Jibai hung up the phone, and Bi Chengyuan also inquired about it, saying, "The recipient's address is here." ”

Xie Jibai took the paper and looked at it and was taken aback.

Could it be that the express delivery that Chen Wanting said just now was sent by Chang Kunbing?

The recipient's address was where Xie Jibai used to live, and the recipient only wrote Mr. Xie, and there was no telephone/phone number.