Xie Jibai felt that he didn't have to be reckless in front of Tang Xin, so he stopped very refreshingly, then found a chair, wiped it clean and sat down repeatedly, watching Tang Xin busy around, a bit like a landlord.

The room was so stinky, especially when it was churning, it was even more foul-smelling. Xie Jibai felt that he was going to be stunted, and he couldn't stand it, so he opened the door so that he could ventilate.

Tang Xin's head was covered with sweat, and his shirt was wet. I have to say that this house is really hot enough, and the most important thing is that it is suffocating, which makes people very uncomfortable.

Xie Jibai said: "How's it going? ”

"Find a wallet," Tang Xin held up the things in his hand and said, "But it should be a wallet that has not been used for a long time, there are only a few silver/bank cards in it, a few coins, a ticket, and nothing else." ”

Tang Xin put his wallet on the table, then continued to rummage, and said, "There are still a few books here that have not been returned, borrowed from the library." ”

"Library?" Xie Jibai said: "Where is the library? ”

Tang Xin said: "I'll take a look." ”

Tang Xin took a closer look, and it turned out to be the library in City C. After Peng Xuebai left City C, he also took a few books with him, and there was a library card in the book, with the names of several books written on it, and the time when the books were returned, but it was obvious that Peng Xuebai had not returned to City C again, so he did not return the books at all.

"But it seems like there's one missing." Tang Xin said: "There are only four books here, and the library card says that there are five books in total, and one is missing...... Cihai? ”

Tang Xin was talking, and there was footsteps going upstairs outside. Xie Jibai turned his head to look out of the door and saw that the corridor light on the fifth floor was on, and someone came up from downstairs.

Xie Jibai stood up, and soon saw an elderly lady walking up with a bag of vegetables.

The old lady should be a resident of the sixth floor, her body/child bones are quite tough, and she is only slightly out of breath after climbing the sixth floor, and she looks quite light/loose.

The old lady was surprised to see the door next door open, and it was estimated that she had not seen the door open for a long time.

She walked up and glanced at Xie Jibai who was standing at the door several times, and saw that Xie Jibai looked upright and didn't look like a bad person, so she said, "Young man, are you new here?" ”

Xie Jibai shook his head, showed her his evidence, and said, "We are here to investigate the case and want to ask you for some news." ”

The old lady didn't expect Xie Jibai to be a police detective, and she was a little surprised. She lived in the room next to Peng Xuebai, opened the door and put all the vegetables she bought into the house, and then turned back to talk to Xie Jibai.

The old lady has lived here for more than 40 years, and her children are older, and she has grandchildren, all of whom live elsewhere, and occasionally come back on weekends to visit, usually by herself.

Xie Jibai immediately pulled out Peng Xuebai's photo to show the old lady and asked, "May I ask if this person lives in the room next door?" ”

The old lady had a bad look in her eyes, put on her glasses and looked at it carefully, and said, "It's him, he lives next door, but I haven't seen him for a while, has he moved away?" ”

The old lady said that because the house is a single house, and the lighting is not good, and it is the top floor, so this house is not easy to rent. Later, the house was suddenly sold, and it was this man who lived in.

The old lady lives alone, she looks amiable, the old lady also went to greet him when the man first came, the man is not very friendly, with a cold face and a particularly vigilant look.

But later, the man lived for a long time, and the relationship between everyone was better, and the old lady knew that the original person's surname was Peng, I don't know where he was, anyway, he lived here alone, and he didn't have any serious work, and he usually went to the convenience store to do odd jobs.

Xie Jibai immediately wrote down the convenience store that the old lady said, and waited for a while to ask about the situation.

The old lady also told them that the man surnamed Peng would not go home for reunions during the New Year's holidays, and would always live here, as if he had no relatives or friends.

The old lady's children would come to visit the door every once in a while, but the next door was always quiet, and there was no one to visit the door.

The old lady said, "Then one day I saw him running out in a hurry, and I didn't know what he was going to do. I haven't seen him since, so I think he may have moved away. ”

At that time, Peng Xuebai did not move away, but died suddenly, so it was impossible to come back.

Later, no one lived in this room, Peng Xuebai's neighbors did not know his name and telephone number, Peng Xuebai did not die in this vicinity, and in the end, no one found Peng Xuebai's address, and the house was empty, and no one has ever come.

The old lady didn't know much about Peng Xuebai, and told her all the things she knew, Xie Jibai and Tang Xin. When Peng Xuebai lived here, he didn't have any contact with others at all, and he didn't have any special behavior, just like an inconspicuous person.

After understanding the situation, Tang Xin went back to the house and continued to "dig out the garbage/garbage", turning over the whole house, and found nothing important, but he was tired enough.

Tang Xin finished looking for everything, took off his gloves and threw them aside, wanting to wash his hands, but there was no water and no hand sanitizer in the bathroom.

Xie Jibai looked at him, frowned, and said seriously: "Otherwise, you go to the old man next to you to borrow some water to wash your hands." ”

This is the only way, Tang Xin said: "How do I think Xiaobai is a little disgusted with me." ”

Xie Jibai said: "It's not an illusion. ”

Tang Xin: "......" is so straightforward.

Tang Xin went to the old lady next door to wash his hands, the old lady was very enthusiastic, and said that they could rest here for a while, seeing Tang Xin sweating profusely tired.

However, Tang Xin and Xie Jibai had other places to run, so they didn't stay long.

The other residents on the sixth floor have not lived here for a long time, and they have not seen Peng Xuebai, which is really not helpful to them.

The two of them left the building and went to a convenience store about two stops away. The old lady said that Peng Xuebai had worked here, and she once walked here and saw Peng Xuebai working here.

The two of them went to the convenience store and continued to inquire about Peng Xuebai.

Peng Xuebai has been dead for a few years, and there are very few people who remember him, and the person on duty at the convenience store is a university/student, and he has never seen Peng Xuebai at all.

However, the boss of the convenience store cleaning has a little impression of Peng Xuebai.

The boss said that there was indeed such a person who worked here, but it was a long time ago, and he suddenly disappeared and never came back.

The boss said that Peng Xuebai was mysterious and didn't like to talk, but he seemed to be very knowledgeable.

Convenience stores have college/students working here during the winter and summer vacations, and he once saw Peng Xuebai giving a lecture to a college/student, but he didn't know what he was talking about, and he couldn't understand it at all.

Xie Jibai was stunned for a moment and asked Tang Xin, "What does Peng Xuebai specialize in?" ”

Tang Xin thought for a while and said, "It seems to be physics, but I also study psychology." ”

"Physics, psychology......" Xie Jibai couldn't help but repeat.

"What's wrong?" Tang Xin asked.

Xie Jibai said: "Give me the phone/machine, and I'll take a look at the photos you just took at Peng Xuebai's house." ”

Although Peng Xuebai's house can be called a garbage/garbage station, and the insects and mice everywhere are disgusting, these may be evidence, so Tang Xin took photos to collect evidence while digging out garbage/garbage, and took a lot of photos and stored them in his hand/machine.

Xie Jibai immediately called up a photo, which was a few books and a library card.

There are a total of five books, four of which are about condensed matter physics, although Xie Jibai can't understand it, but the book cover can still understand it.

And the other one......

Xie Jibai said: "I also borrowed a book of Cihai? ”

Four physics-related numbers and one dictionaries, this combination is really strange.

Because of the appearance of the old lady just now, Xie Jibai didn't notice this, but now he suddenly remembered it.

Tang Xin also felt a little strange and said, "Peng Xuebai borrowed Cihai? What is he used for? ”

Xie Jibai said: "Maybe it's just a trick. ”

Cihai has the most characteristic that many people seem to be able to find at a glance, that is, thick, very thick. If you add a few photos to the sea of words, it may be easier to hide than in other books, and it will not be easy to find.

Xie Jibai said: "The question now is where is the sea of words? Why is it gone? Could it be that someone took it first? ”

Tang Xin said: "I'll call the boss first, and ask them to go to the library to check." ”

Xie Jibai nodded.

Chen Wanting received the call/call and immediately went to the library with Su Banyu.

A little girl took them to find Cihai, and there are very few reference books borrowed by ordinary people, especially this kind of particularly heavy reference books, which no one will borrow once a year.

They went up to the fourth floor, and on the top floor, on the innermost row of bookshelves, were lined with very thick dictionary books.

Chen Wanting told the little girl the book number, and the little girl found the book for them, and soon found it.

However, Chen Wanting picked it up and looked at it, and said, "No, it's definitely not this one." ”

Cihai is too new, turn it back, there is time on it, it is the new version of Cihai this year, it must not be the one that Peng Xuebai borrowed back then.

The little girl said, "Are you looking for old books?" ”

Chen Wanting nodded.

The library will update the books regularly, and the books that are too damaged will be re-purchased/bought with new ones, and the old books will be stored in the warehouse, and the warehouse will be disposed of when it is full.

The little girl took them to the warehouse, where there were a lot of books, and there were so many that they needed to be found manually.

Fortunately, what they are looking for is a very thick sea of words, so at a glance, most of them can be distinguished from the thin and thick dù.

Su Banyu and Chen Wanting hurriedly began to rummage through those very thick books, looking for them one by one.

"Is this one?" Su Banyu said suddenly.

Chen Wanting immediately went over and saw Su Banyu putting a very thick book on the table, which was full of dust.

The sea of words is too thick, and it is difficult to turn it up, and it seems that it should be about the same as the time.

Chen Wanting opened the sea of words, and quickly flipped / moved with "whoosh".

"There's something in there." Su Banyu said suddenly.

Chen Wanting hurriedly flipped it back again, this look was a little dumbfounded, there was indeed something inside.

A hole was cut in the middle of the dozen pages, which looked to have been cut with a knife, forming a groove, and there were many photos inside.