215 Blue City Avenue.

There is an ordinary yellow envelope lying quietly in the 603 mailbox on the first floor of Building A in the garden community, it has been here for no less than a week, but the owner of the mailbox never seems to be interested in opening this small grid, yes, ordinary letters have been gradually replaced by various social software in this era, who still spends that time to write letters.

Until a certain Spring Festival just after dusk, a handsome middle-aged man finally walked here, although his face was tired but his eyes were sharp, he took out a bunch of keys from his pocket after a few glances, and gently opened the mailbox.

In addition to the mailing address, there are also a few words written on the envelope: Teacher Li received, and the payment was made: Student Xu Jingnan respectfully.

The middle-aged man frowned slightly, probably remembered for a moment, then folded the envelope in half in his hand, locked mailbox 603 with his other hand, and then walked into the elevator to the 6th floor.

He opened the door and saw that the lights were on in the room, and couldn't help laughing, "You haven't gone downstairs for a few days?" The smell of tea wafted in the house, but no one answered.

It wasn't until he changed his slippers and walked to the sofa in the living room and sat down that the people in the room put down the heavy books in their hands, raised their eyes, and said, "There are not ten days, but eight days." ”

The middle-aged man who went upstairs was Li Yiting, the former head of the criminal investigation section who retreated bravely, leaning on the sofa at this time and closing his eyes to recuperate, he was a little tired.

Chen Tianyu was drinking tea in the restaurant, he gently tapped the table with the corner of the book, and did not speak again.

Li Yiting's eyes didn't open, but he said loudly: "I received a letter." ”

"It's a lot of fun. Chen Tianyu walked over quickly, took the envelope in Li Yiting's hand, glanced at it roughly, and said with a smile: "I originally thought it was a love letter written to you by a woman, but I didn't expect it to be a letter written to you by your student, which is boring." He threw the envelope back to Li Yiting.

Li Yiting sat up slowly, and said while opening the letter: "What's the meaning of love letters, students' letters are very interesting." Don't you know that I've never confiscated students?"

Chen Tianyu returned to the dining table and picked up the book to continue reading, but said lightly: "It is not necessarily the teacher who calls the teacher now, and the nature of calling the student is not necessarily the student, why should you be sentimental." ”

Li Yiting didn't answer, he unfolded the letter paper and looked at it silently, and after a while, he was actually full of energy, he greeted him with some excitement, and Chen Tianyu was immediately attracted by his expression.

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Dear Mr. Li,

Hello!

I don't know if you will receive this letter, I don't think you can remember me, my name is Xu Jingnan, I used to study forensics, but now I am doing some office chores in a remote border police station, I think, in two years, I can no longer be called a forensic doctor without any practical experience.

The first time I saw you was not long after I entered the school in my freshman year, when you were already a well-known senior in the police field, I still clearly remember the scene of your lecture in our school, buried in the sea of people, I was like looking up at an unattainable mountain, those stories of fighting wits and courage with fierce and cunning criminals made me passionate, and I was determined to be a truly excellent people's policeman like you.

After graduation, there was a big gap between reality and ideals, not to mention the uselessness of the major, and those big, serious cases were very, very far away from me, which made me feel deeply confused.

I took the liberty to write to you this time, because I recently came across a case that I thought was very strange, but everyone, even the experienced director, thought that I was whimsical and cranky.

Here's how it happened-

In our suburban town, there is a village named Buenyou, in the village since the founding of the People's Republic of China, there is a scientific research institution called the 5578 Research Institute Zhongnan Branch, the institute is located in the middle of nowhere, few people know its specific location, but a few days ago there was a case of missing people here, after a preliminary investigation by our border police station, the vast majority of people think that this technician named Xiao Meng left his job without permission, and the leader of the institute later privately informed the police that this person secretly took away a confidential document when he left.

At first, this incident was not unusual, but this person's roommate Xiao Zhou repeatedly provided clues to the police, trying to prove that the person did not abscond with the theft, but had an unknown change. However, after our investigation and on-the-spot investigation, there is no evidence to support the possibility of other cases.

Just a week before the letter was written, Xiao Meng's family suddenly came to the research institute dignitaries, claiming that the person had been missing for nearly 20 days, and asked the unit to give an explanation, so the research institute and Xiao Meng's family called the police again.

The higher authorities attached great importance to it and immediately sent experienced criminal police to assist in the investigation, but this Xiao Meng was like evaporating from the world, without a trace. No one has ever discovered his whereabouts, nor has he had any travel or entry and exit records, nor has he even appeared in the monitoring probe at the entrance of the unit (the institute has high walls on three sides, one facing the sea, and ordinary people can only enter and exit through the entrance of the unit).

Now, there is a kind of suspicion in the institute, and rumors are spreading. Some people say that Xiao Meng fell into the sea and died, some people say that there may be some wild beasts in the barren mountains and mountains here, and some people even say that it may be a ghost, and he actually wants to ask a mage to drive away evil spirits and avoid disasters. Many staff members have shown their willingness to leave their jobs, but our police station has no choice but to do anything, and the investigation by the higher authorities has been fruitless.

I remember my teachers saying that there are no ghosts in this world, and that bizarre cases often end up being man-made, and I think this is certainly the case. Although I am only a trainee forensic doctor, I don't believe in ghosts and gods, but I really can't figure out what to do without leaving a trace.

In my opinion, there are at least three doubts in this case:

First, it is impossible for people to disappear out of thin air, and there must be negligence and omission in which investigation link;

Second, roommate Xiao Zhou is a key person, maybe there are some things he doesn't care about, which will become an important clue to solve the case;

Third, the occurrence of an event without anyone being aware of it is incredible, and there must be an intricate hidden story behind it.

Do I have so little experience that I think of simple things too complicated, or am I too eager to express myself and think about what is wrong?

Now, the case has been temporarily shelved, and there is still no time to solve the case, and Xiao Meng's family has no choice but to accept the fait accompli and go home to wait for the results of the police investigation.

The institute arranged other tasks for me, but it was the daily chores of the village to lose the cow and the village to the west, and life seemed to be calm again, but my heart was never calm, and I always thought about this strange case with insomnia every day, did it really make it an unsolved case?

I don't know if the mailing address you left with my classmates by accident has been changed, so let's take it as an attempt to give yourself a chance to learn and gain hope.

Sincerely

salute

Unproductive student: Xu Jingnan

January 18, 2117

Chen Tianyu said with a smile: "It turned out to be your admirer, I don't know if he is modest and studious or suspicious, do you plan to reply to him?"

Li Yiting didn't speak, and said after a long time: "This young man named Xu Jingnan seems to like to think about problems, but I don't seem to have anything to help him, what is your opinion?"

Chen Tianyu's eyes were uncertain, he just shook his head and said: "The future of your police is always young, everyone needs to be experienced, why don't you as a senior give you some advice, even if you don't have any unique opinions, it's always okay to give a few words of encouragement." ”

Li Yiting took out a cigarette and lit it, not knowing what to think, and nodded after about half an hour.

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As night fell, the lights of the city began to shine, spilling through the gaps in the various buildings in this small room of only about ten square meters.

The room was not lit but everything was clearly visible.

Li Yiting sat at his desk, with a few pages of stationery and a pen in front of him, and he decided to reply to the young man, but he didn't know where to start for the time being. He likes to think about problems in a relatively dark place, but now in another distant crime scene, without any investigation and evidence, only based on the written description of a young man, how can he deduce and answer?

Li Yiting knew that Chen Tianyu, a cynical guy, was still in the living room at this time, forgetting to sleep and eating, if this person didn't find some clues, he would never encourage himself to reply to someone, but he wouldn't ask questions, Chen Tianyu relied on intuition, it was impossible to open his mouth about uncertain things, he was a criminal investigator, and he should give an answer from a professional point of view.

After much thought, he finally turned on the fluorescent lamp in the room and began to write slowly.

The rustle of the tip of the pen across the letter paper flickered fast and slowly, and in such a quiet night, every stroke was clearly audible, and it reached the ears of Chen Tianyu, who was holding a book in the living room.

Chen Tianyu was not reading, he was just staring at the page, but his thoughts had already flown into the distance.

He suddenly began to think about the past for no reason, recalling the beautiful encounter with Zichen, the unexpected encounter with Yiting, the silent cultivation with Yongkun in the small mountain village, a few like-minded people at a coincidental time, an unexpected place, and all kinds of wonderful, and finally finally working and living together, sometimes it is quite interesting to think about.

If you say that you live for your dreams, then a pavilion is a person who lives for your ideals, and your dreams can be ethereal and difficult to find, but the ideal of a pavilion is a real down-to-earth thing, and the reason why he left his original job is still to eradicate evil and defend justice, and there must always be something specific to do.

Chen Tianyu sighed inexplicably in his heart, one pavilion, one pavilion, our Infernal Affairs has just begun, and it is unknown whether it is a blessing or a curse.

It was drizzling outside, and the wind was still blowing, which increased the chill a lot; now that the Spring Festival has passed, spring has not yet come, and there are some days before everything recovers.

Is spring really still far away?

Let this young man named Xu Jingnan open the door to the unknown, and let Yiting regain the majesty of the year.

He gently closed the book, and his otherwise calm swarthy face instantly glowed.