Shen Mingyue said with a smile: "Where do you say?

"Exactly. Xu Jingnan said appreciatively, "This is the core point, if there is no second person at the scene, then no matter how you interpret it, Xiao Su can only be convicted of suicide." In other words, as long as we can find the clues of this person's invisible person, then all the mysteries will be solved, and the cause of Xiao Su's death will have another result. ”

"Based on the consideration of his killing, we have to change our thinking. Assuming that this second person exists, where did he come from and where did he go? Where did Xiao Su himself come from and die here?"

The answer is very simple, that is, the murderer and Xiao Su entered the scene from the men's toilet, and after one of them killed Xiao Su, he hid from the men's toilet, leaving no traces in the whole process. ”

Shen Mingyue looked at him directly and didn't speak, Xu Jingnan hurriedly smiled in disguise.

He continued: "If there really is no trace, my claim is completely untenable. So I had a bold guess that there must be traces, but we just didn't find them. ”

"First of all, a loose cement block appeared in a pit lattice in the men's toilet, which had been hit by an external force, so there was a hidden crack, which could not be found by the survey at the time, but finally revealed after a month. I guess it was caused by the heavy extrusion, and it was elastic extrusion, leaving no damage, and this cement block was accidentally discovered by me. I pondered for a long time, and the most plausible explanation was that someone was wearing soft-soled shoes and repeatedly stepped on this part. ”

"The purpose of stepping on this position is nothing more than to climb the vents that are located nearby, and with that in mind, I have basically finalized the role of the vents. So, I went back and forth to check the vents, looked at the distribution of the dust of different thicknesses, and hey, sure enough, inspiration came again. ”

"You can't get around. Shen Mingyue said impatiently in a low voice, but she didn't want to interrupt Xu Jingnan's train of thought.

Xu Jingnan chuckled: "This is still around, elm head, let you think about it yourself, you may not be able to figure it out in the next life." ”

Shen Mingyue glanced at him, but she was rarely silent, she knew that Xu Jingnan was telling the truth.

Xu Jingnan smiled again: "Go on." From this, I made an assumption that if the other party is a master, at least a master of counter-reconnaissance, he will inevitably remove traces of various parts. This can be reversed from the absence of footprints at the stepping part, and the footprints must have been wiped off by the other party with a soft cloth. ”

Based on this assumption, the traces of the vents must have been removed. No one would be so stupid to leave such obvious wipe marks, let alone a master. ”

He sighed suddenly: "The reason why we were blinded at that time was precisely because the vents had neither climbing wipes nor cleaned appearances, so we fell into a logical circle and gave up doing useless work for the air vents that accumulated thick dust. ”

"I believe that no living person on Earth can pass through such a 50-centimeter-square vent like an immortal flying in the sky, without touching the surrounding dust at all. Xu Jingnan said very firmly, "It's impossible!"

This confused Shen Mingyue: "What do you say? Fifty centimeters is big enough, what if it's a child, step on the cement lattice, and then jump out?"

"No way. Xu Jingnan was determined.

"Why? There are so many kids who can jump so much now. Shen Mingyue disagreed.

Xu Jingnan analyzed: "This problem is too simple, because I have just measured the horizontal distance between the cement lattice and the vent is more than 1 meter, and the vertical distance is also more than 1 meter, and the vertical distance is twenty or thirty centimeters larger than the horizontal distance." There is no place to borrow any strength, and there is no trace of stepping on it, do you think a child who is more than a meter tall can jump over? Maybe his head has not reached the vent. ...... The only way is to climb. ”

"Oh. Shen Mingyue thought about it seriously, she didn't mean to be unreasonable, so she quickly agreed with Xu Jingnan's statement, "That's right." ”

"Hey, if it's an adult climbing, there's no trace? ”

Xu Jingnan looked at her with a smile and nodded: "That's right, naturally it's even more impossible." That's the crux of the case. ”

Shen Mingyue agreed: "Well, if this person can climb in and then remove all traces, then he will definitely not be able to do it when he leaves, at least the stepping part with his strength will definitely leave footprints." If the person is tied to the vent and turns around to remove the footprints, then there will definitely be marks on the vent. Unless this man is holding a stick or something, and a rag is tied to his head......"

She said impatiently: "Oh, it's over, it's over, it's over, my head is about to burn, and there will definitely be marks on the vents." Forget it, tell me the answer......"

Xu Jingnan didn't tell you like he wouldn't tell him, and Shen Mingyue directly shook his hand and gave him a big chestnut.

He touched his head helplessly, this guy was too violent.

"It's not that I don't say it, it's that I'm just a bold conjecture, so I want to hear your opinion. Xu Jingnan was slightly aggrieved.

"Say, what conjecture?" Shen Mingyue didn't want to ponder, she looked at Xu Jingnan coldly.

"That's right. Xu Jingnan said helplessly, "Assuming that there are indeed traces on the vents, and the dust has also appeared wiping marks, then, in addition to cleaning the dust, is there any other way to cover up the traces?"

"I stood here and observed for more than half an hour, and an idea suddenly popped into my head, since subtraction doesn't work, what about addition?" He glanced at Shen Mingyue's reaction, and happened to see her cold gaze shining directly, and suddenly didn't dare to ask again.

"I looked at the uneven distribution of dust on the vents, and I came up with this addition. That is, this man was carrying a bag of dust beforehand......" he smiled for no reason, "After the murderer made a mess of the vent, he stood outside the vent, took out this bag of dust, and sprinkled it on the vent, oh, not accurately, it should have been blown on the vent, covering all the wiping marks, which caused the uneven shape. And the current forensic technology is absolutely unable to distinguish whether the dust originally existed on the vent or is foreign. ”

He added very rigorously: "Of course, I am not talking about now, and it is completely impossible to judge now, because there is a lot of new ash to appear, at least much thicker than before." After all, more than a month has passed, and the environment here is quite dirty, and it is impossible for anyone who surpasses ordinary people's eyesight to find it again, but it just inferentially inferences that just inspire. ”

"It's kind of. Shen Mingyue told the truth, but she also agreed in her heart that this speculation may be true.

"So, the murderer must have existed, and he escaped through this vent," she asked. ”

"Judging from the clues we have so far, we can only judge it this way for the time being. Xu Jingnan said cautiously, "However, with such an assumption, at least the existence of a murderer cannot be completely ruled out." Comprehensive analysis, the possibility of Xiao Su's suicide is also getting lower and lower. ”

Shen Mingyue nodded: "Well, before there are no other clues, let's just think that's the case." She playfully said, "You can, boy!"

Xu Jingnan scratched his head: "It's so-so." As a member of the North Pavilion, I can't always be worthless."

"Hmph, it's good to know. Shen Mingyue thought for a moment, "Then I'll rest for a night, and then I'll go back to Dali, what about you?"

Xu Jingnan shook his head: "I am already satisfied with such a discovery, besides, in the past month or so, so many people have come and gone in and out of the scene, and it is impossible to have any breakthroughs." If I continue to struggle, I will only delay my work, so I'd better go back to the police station, and I'm still very busy there at the end of the year. ”

"Well, there will be no time after that. Shen Mingyue waved her hand, turned around neatly and left the alley.

Xu Jingnan looked at her fiery back, and somehow, a trace of warmth appeared in the corners of her eyes.

Having such a team is enough!