When Shen Mingyue came, Xu Jingnan was still in the back of the public restroom, looking intently at the fifty-square vent, not knowing what he was thinking.

Shen Mingyue had no choice but to walk into the alley by herself, and her feet were still a little frozen if she didn't move.

About half an hour later, Xu Jingnan slowly turned out from behind, he beckoned to Shen Mingyue, Shen Mingyue pursed his lips and went up to meet him.

"Hehe, great forensic doctor, does it smell good?" Shen Mingyue couldn't help but make a joke.

Xu Jingnan said lightly: "It's okay." ”

Shen Mingyue didn't say much, she took out a letter from her personal pocket and handed it to Xu Jingnan.

Xu Jingnan took out a napkin and wiped his hands, then took it: "What is this?" he asked casually.

Shen Mingyue smiled playfully: "Xiao Su's letter to a little girl has just been received a few days ago. ”

"Oh?" Xu Jingnan's eyes lit up, his movements suddenly became sharp, and he pulled out the thin letter paper in three or two clicks, and then carefully unfolded it.

"Hmph, I guess you can't find anything famous, so after getting this letter, I rushed over to support you as soon as possible. Shen Mingyue boasted beautifully, for Xu Jingnan, a "junior", she has always spoken politely.

"Really? How do you know I can't find a clue. Xu Jingnan ignored her, and looked at the letter in his hand seriously as he spoke, "Well, this is indeed Xiao Su's handwriting." ”

Shen Mingyue cut off: "Can there be anything wrong with that?" ”

Xu Jingnan echoed: "You are indeed my aunt and grandmother, you came very timely, thank you first." ”

His attention was now attracted by the content of the letter, and Shen Mingyue also came over curiously, she hadn't read this letter yet, for fear of accidentally destroying extremely rare trace evidence, such as fingerprints and the like.

It's a text message, not too many words, but it looks very seriously written, and it is neatly drawn one by one.

"The seventh sister is well:

It's been more than a year since you knew it, and I guess you still don't know who I am, right?

What does it matter, you gave me an emotional sustenance, and that's enough.

Don't think I've helped you anything, I'm helping myself, so you don't owe me anything.

I regard you as my own sister, and I used to have a sister who depended on each other, but unfortunately, poverty took her life, and I don't want poverty to befall you again, so I hope that I can do a little bit.

Money is not a matter for me, I don't need to take it to heart, but your stubborn happiness is something I don't have.

Infect me a little, count it as my brother, please beg you.

I usually mail it to you regularly, but I have been in trouble recently, and sometimes I may not be able to get away, so I ask someone to help me do this, I just want you to know that I am here every month, and I will always be there in the future, and I will miss you once in a while, and I wish you happiness silently.

I didn't want to write this letter, but I don't know why, I was a little restless during this time, and after thinking about it, I would like to leave you a few words, maybe be more down-to-earth.

Don't worry, I'll give you a "flying pigeon biography" every month.

I hope you like the book I sent you, that's what I really want to give you.

- Xiao Su, a name you haven't heard of, a name I like best, a name that only you know.

In the future, you will call me like this, Xiao Su will be me, you don't have to worry about what others call me. ”

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After reading the letter, Xu Jingnan was silent, his eyes were uncertain, and after a while, he carefully put the letter back into the envelope.

"How? Do you see any clues?" asked Shen Mingyue with flashing eyes.

Xu Jingnan thought for a while: "Not yet." ”

Shen Mingyue hurriedly said: "I worked hard to get this letter, you mean it's useless?"

"Of course it works. Xu Jingnan couldn't help laughing, "A letter from a dead man, do you say it's useful? ”

Shen Mingyue said angrily: "You won't tell me that this Xiao Su is still alive, right? That's the explosive news." "She's got a big brain.

"Hey, the corpse has been dismembered by me, how can you bring him back to life?" Xu Jingnan said jokingly, and there was a hint of brightness in his eyes, "Unless that corpse is not Xiao Su's." ”

"Is there still such a possibility?" Shen Mingyue said in surprise, "Wouldn't it?"

Xu Jingnan finally laughed: "I'll say Miss Yue, your imagination is too rich." Although we don't know Xiao Su, will Fourth Brother and Sister Zichen still admit their mistakes? ”

"Little brat, what are you talking about?When is it your turn to teach your sister a lesson?" Shen Mingyue was furious, "When I debuted, you didn't have any hair, but now you have a good ability?"

Xu Jingnan shrunk his neck, not daring to say anything, he really couldn't afford to offend.

"Tell me quickly, what's going on?" Shen Mingyue gave the death order.

"I'm afraid of you. Xu Jingnan thought for a while, "I'm not engaged in criminal investigation, I didn't think about it, go back and ask for advice and then tell you." ”

Shen Mingyue glared at him, not believing his excuse at all.

Xu Jingnan said helplessly: "At present, the only thing I can be sure of is that this Xiao Su will not commit suicide." That's what I see in the letter, are you satisfied?"

Shen Mingyue shook her head: "Not satisfied." What if the letter was forged by someone else, or ghostwritten?"

"It's unlikely. Xu Jingnan said cautiously, "The first is that the content of this letter is very ordinary, and there are almost no important things; second, I have read the letter written by Xiao Su to Yiruo in the detective group, do you think I can't even tell if the handwriting is consistent?"

He asked cautiously, "Are you sure that this letter was originally contained in a book?"

Shen Mingyue didn't speak for a long time, she came back to her senses: "Seventh sister is reluctant to give it to me." ”

"What is the title of the book, you always know this, right?" Xu Jingnan said helplessly.

"I didn't pay attention to ......" Shen Mingyue seemed to remember, ""Ordinary World, what's wrong?"

Xu Jingnan nodded: "It's nothing, just to confirm." Then my speculation is inseparable, and the possibility of Xiao Su committing suicide is zero. ”

Shen Mingyue pursed her lips: "You still need to confirm this, we already know it." Otherwise, after investigating for so long, do you think we have nothing to do when we are full of food in Beiting?"

"Hey, eldest sister, don't forget that I'm also from your Beiting, that's sad. Xu Jingnan smiled bitterly, this thorny rose is unforgiving everywhere.

"You're wearing a tiger skin, don't be close. Shen Mingyue said happily.

She seemed to remember something, stared at Xu Jingnan and said, "What were you peeping in the women's toilet just now?"

Xu Jingnan's face was suddenly full of black lines: "I'm looking at the men's toilet, please!"

"Oh, I see. Shen Mingyue said suddenly, "You must have discovered something, otherwise this possibility is zero, and it will never come out of your mouth." ”

"The judgment was absolutely correct. Xu Jingnan raised his hand in surrender, "I can't hide anything from the eldest lady." ”

"It's just a matter of hiding it. Shen Mingyue was completely happy, "Do you think I'm a vegetarian, say it quickly, I'm curious." ”

"Good. Speaking of business, Xu Jingnan's face suddenly became solemn, "I found a very strange phenomenon at the vent just now, which made me puzzled. ”

"What phenomenon?" Shen Mingyue couldn't help but be infected, and asked with wide eyes.

Xu Jingnan said seriously: "I found that the dust on the bottom surface of the vent was uneven in thickness. This is a very significant discovery......"

"Poof-" Shen Mingyue couldn't help it, and scolded with a smile, "Little brat, don't I understand anything?"

"Don't worry, according to common sense, there really is nothing abnormal about this. Xu Jingnan nodded yes, "And more than a month has passed since Xiao Su's death, and the dust has already changed, and the police have also investigated the scene at that time, and it is unlikely that they will not be able to find any wiping marks." ”

"yes, an afterthought. Shen Mingyue was puzzled, "Then what do you mean?"

Xu Jingnan said excitedly: "Although these old dusts no longer have any trace and physical evidence value, they inspired my thinking in an instant. ...... Let's analyze it from the beginning, what is the core key point of this case?"