"Your monitoring equipment here is usually only arranged at intersections, right?" Ling Shucheng visually measured the width of the small ditch on the left, "So the two closest to the location of the crime are in——"

"The place where we just met, and the bench where Miss Ye finally noticed something was wrong and fell. The distance between the two monitoring points is about 400 meters. Qiu Pingning answered quickly, "No way, the area of the city is too large, and it is almost impossible to cover all the places." The cameras in the urban area will be relatively densely set, but this kind of suburban will not work. ”

"What did the two cameras catch?"

"At 21:52 last night, the victim, like us, walked past the camera on the south side. Then, because she died in the middle of the straight, she was not caught by another camera. Qiu Pingning pulled out a small notepad from his chest pocket, "Eleven minutes later, Miss Ye also walked over from the same direction. She didn't walk fast, and it took about seven minutes to get from one end to the other. ”

"Didn't shoot the murderer?" Ling Shucheng continued to ask questions.

"Yes, otherwise there wouldn't be so much going on now."

Ling Shucheng frowned and stood still in the middle of the road for the time being. There is a straight path in front and back, with a ditch about five meters wide on the left and the last meadow on the edge of the park on the right, with a few flower beds and a few small western-style buildings scattered in the middle of construction.

Roughly understanding the meaning of the other party's eyes, Qiu Pingning then explained: "At first, we also wondered if the murderer came all the way to the grass. But not to mention that the grass is already very dense this season, and it will definitely leave obvious marks after stepping on it, and more importantly, the east side of the park is connected to the villa area next door. I've been to the field to see that the security on their side is very good, and if the murderer is indeed a 'normal person' with no special functions, there is basically no possibility of sneaking over there. ”

"But I read on the news that you found the murder weapon in this meadow to the east."

"Yes, to be precise, the killer threw a bloody knife into a small pond in the park that was used as a landscape." Qiu Pingning pointed his finger forward and pointed him to a general location, "We will have to walk a little more to see it." In addition, the reason why I can emphasize the 'traces' with you so definitely is because we did find two small sets of footprints left by the murderer in the process of abandoning the murder weapon in the grass. It seems that he must have climbed onto the lawn and abandoned the murder weapon before turning back on the road. Only then did I bump into Miss Ye who was coming over again. ”

"There's a ditch on the left here, and the water is still flowing. Isn't it more suitable for dealing with murder weapons? Ling Shucheng quickly realized that something was wrong, "Why did he deliberately go up to the lawn and throw the knife into the pond, and then turn back again?" ”

"I guess it's probably to use the dirt to deal with things on the soles of your feet, such as bloodstains, or ......" Qiu Pingning pointed to the track that was set up horizontally above the path not far away, "Just like Miss Ye, the murderer may also have accidentally got blood stains on the way to the murder." In order not to leave a trail of bloody footprints for us to easily spot his traces, he first stepped on the wall that circled the load-bearing pillars below the track after killing people under the tracks, and then jumped directly onto the lawn - the first footprint was indeed deeper. The dirt and blades of grass scraped most of the blood off his feet, and the murderer leisurely disposed of the murder weapon......"

"I think it's a bit too far-fetched." Ling Shucheng shook his head, "Let's not mention that your speculation actually doesn't solve the problem of where the murderer came from and where he got out. What's more, the murderer's feet will be stained with mud again. Even if there is no obvious bloodstain, the effect of revealing your whereabouts at a short distance should be the same when you look closely. Besides, I still don't think that such a reason would make the murderer choose to go far away. ”

"You listen to me first." Qiu Pingning not only did not look discouraged, but had a somewhat eager expression, "Have you noticed this small river ditch on our left?" I guess it's very likely that the killer came by dripping water. ”

"Dripping water?" Ling Shucheng was a little surprised.

"yes, don't you have such an incredible expression. I've tried it myself during the day, and if I keep walking by the river, the deepest part is just below my knees. "This small river crosses the park, and further on, you can go directly to several private schools and better hospitals." I thought about it carefully, killing people with a knife is actually very difficult for ordinary people with no training, but there are some professionally trained students in those private schools. Taking advantage of the night, I quietly touched the river, and I swam while walking, and it shouldn't be difficult to get here by bypassing the surveillance. If you think about it this way, it all makes sense. ”

"Huh? Why? ”

"I went to the lawn to wipe the water from my feet, so that we wouldn't notice that he had come up from the water. Throwing the murder weapon into the pond is also to divert our attention from the ditch. ”

A train sped past the overhead tracks, like a band of warm yellow light piercing the night sky. Ling Shucheng stared thoughtfully at the train gradually disappearing into the small hills in the distance, and then said lightly: "I think, it shouldn't be like this. ”

"Why?" Qiu Pingning was a little unconvinced, "You have to think clearly, although this statement is somewhat far-fetched, it can still barely fool a few of us in the bureau." If it weren't for that, I can't imagine what ordinary people could have done to commit this crime. Of course, we also limit ourselves to death, maybe it is not difficult for the gifted to fall from the sky. ”

"If he came up from the water, whether it was the footprints or the splashes when he came ashore, he would have left some clues. Did you find anything like that? Ling Shucheng asked.

Qiu Pingning's eyes turned quickly, and he hesitated for a while and said: "Maybe so, he kept squatting in the water until the victim walked to the wall, and then slowly came out." It's a short walk, and if you're lucky, you may not leave footprints, or the water stains have been mixed into the pool of blood and we can't see it...... After killing her, he rubbed the soles of his shoes on the lawn again......"

"I don't think the victim can hear a person climbing ashore, it's quiet at night." Ling Shucheng paused for a moment, and added, "Miss Ye was in a special situation at that time, and she did see the murderer coming towards her normally. If the other person looked like he had just crawled out of the water, she couldn't have noticed it at all. ”

"Not necessarily, right? She reacted so slowly...... "Qiu Pingning was still struggling, "After all, pure water is not the same as blood, and now it's not cool at night, maybe when our people arrived at the scene, some traces had already evaporated?" ”

Even if Miss Ye didn't pay attention at the time, Zhai Yiwen, who arrived here in ten minutes, would have paid attention. He was an attentive man. Ling Shucheng patiently smashed the other party's obviously subjective "evidence" in turn, "The most important thing is that if he really came from the water, he can jump into the water and leave immediately after confirming that the victim is dead, and it is unlikely that he will happen to bump into Miss Ye again." ”

Qiu Pingning was silent.

The evening breeze emanates the scent of jasmine from the flower beds. Ling Shucheng looked at the abrupt outline of the wall not far away, and asked an irrelevant question: "Why did you deliberately enclose the load-bearing columns?" ”

"On the surface, it's to prevent people from going to the pillars and scribbling." Qiu Pingning smiled a little helplessly, "But I think it's a little safer for some people above, and it may be able to prevent some talented people who want to harm society from blowing up the track." ”

The silence between the two lasted until another train passed by. Qiu Pingning turned his head inadvertently, and happened to bump into Ling Shucheng's dark eyes, which were illuminated by the light sprinkled in mid-air.

"Listen to what I've said so much, Mr. Ling, what do you think?" He couldn't help but ask.

Ling Shucheng also slowly focused his gaze on him, nodded, and said seriously: "I have figured out most of it." ”

"Huh?" Qiu Pingning's pitch was raised by an octave.

"I think ......," Ling Shucheng raised his head slightly, "he may have come down through the track of Line 7." ”

"How-"

"There was about five minutes between the two trains, enough to walk from one end to the other, and the killer only had to walk two-thirds of the way, then hold on to the base of the street lamp on the side of the track, slide down a little, and jump to the top of the fence." Ling Shucheng visually measured the distance, and nodded again, "It's not easy. But for those who are a bit basic, it can be done. ”

"You mean, the killer climbed over the guardrail on the side of the track and made his way all the way down the railroad tracks? He's not afraid of being hit to death? ”

"There are mountaintops and forests on both sides of this track, and the management is not too strict, and it should be possible to pinch it for five minutes." Ling Shucheng's tone seemed to be very sure.

"I think your reasoning is even more unrealistic than mine." Qiu Pingning didn't buy it.

"But in this case, it is easy to explain why he didn't flee the scene in time after killing someone, but instead set his sights on Miss Ye again." Ling Shucheng pointed to the wall, "He squatted there, and after the first victim came, he originally wanted to turn around and climb up again, but there was not enough time. ”

"What do you mean......"

"Miss Ye told us that she was about a third of the way down the road when she saw the first train passing by." Ling Shucheng's face was expressionless as always, "It will definitely take longer to climb up than to jump down, the murderer is likely to realize that he has no time to seize this gap, and he saw a figure approaching, and after weighing it, he decided to kill Miss Ye by the way." A man walked a few steps forward, and he continued, "The murderer is half a head taller than Miss Ye, that is, about 1.75 meters. According to the height of the lights here and the spacing of the placement, in order to avoid the shadow being detected by her when following behind the karma shuangshuang, the murderer should keep a distance from her at first, and then slowly get closer. ”

Qiu Pingning pursed his lips and followed silently.

"I suspect that the reason why the murderer chose the location of the crime under the track is partly because it is the closest to the place where he came down, and it is more time-saving to go up. On the other hand, it is also to prevent passengers staring out the window on Line 7 from stumbling upon it. Ling Shucheng suddenly squatted down next to a flower garden and picked up a few short branches with a new section, "He should have chosen the second place of the crime near here." When Miss Ye approached here, he would suddenly attack from behind, and then hide the body in the bushes. If something happens, he can hide here for the time being. ”

"What is this? Profile? Qiu Pingning was really a little surprised at this time, "Didn't you say that criminal investigation and the like are not within the scope of your specialty?" ”

Ling Shucheng turned his head to look at him, did not answer his worthless question, and then elaborated: "I heard that another male friend was going to arrive here, and the murderer had to choose to hide. At the same time, Miss Ye went all the way, first hung up the phone, intending to rest in place, then realized that the situation was wrong, and was stunned for a while, and finally, the second train passed by at this time. I think at this time, the murderer may be crouching on the fence about to turn back on the track. ”

"It seems to make sense, but no-"

"For evidence, you might be able to look up the fence to find a point of strength, such as the bottom of a lamppost, a protruding stone, and so on. I think even if he had stepped on the lawn before, he would have accidentally scraped off a little bloody dirt during the climb. Ling Shucheng finished speaking calmly, but his brows were still frowning, as if he still had some doubts unanswered.

"If that's the case, what do you think we should do next?" Qiu Pingning spread out the notebook in the palm of his hand, "Expand to all residents along Line 7? Actually, I wasn't entirely in favor of just searching the neighborhood before. Although it is faster to escape close to home, the risk of being caught has also increased, and I have never seen a few prisoners dare to do it at home. ”

"Not necessarily, but in general, I don't think it's likely to be a student in the neighborhood."

"Why?"

"Because of the blood." Ling Shucheng tried his best to sketch the silhouette of the prisoner in his heart, imagining how he jumped from the sky step by step, hibernated in the dark, and killed someone with a single knife, "Judging from the amount of bleeding of the victim, it is impossible for the prisoner to remain clean, so I will even let Miss Ye rub a little." It was very difficult to completely avoid the eyes and ears of people along the way, and if he did not live alone in a relatively secluded place, it would be too easy for those who saw him to be suspicious. Students who live in dormitories can be excluded first, because students are the group with the best energy at night, and it is too risky to return to school with a bloody body. ”

"If everything is really the same as you speculated, then I'm really convinced today. I'm going to call a few of the people who are doing the appraisal to come over. Qiu Pingning let out a long breath and quickly took out his headphones, "Why are you still preoccupied?" ”

"I still haven't figured out why he left the murder weapon there. If it was just to deal with the blood on his feet, he could have stepped on his feet and then turned around and threw the knife into the river......" Ling Shucheng pressed his eyebrows with his fingertips and muttered to himself, "Is it a temporary idea?" Still is...... Does it have to be like this? ”