When Deng Haoran and Long Xirui came to the British community again, the door was closed. Naturally, neither of them had a key card, so he rang the doorbell.

"A lot of times, people go from one extreme to the other." Impatient, he complained.

"It's not too late to make amends. Looks like we're late. ”

It was the manager of the property in the community who opened the door, and he rubbed his sleepy eyes and said, "Captain Deng, you are back again!" ”

"I didn't expect you to go out in person today, manager."

"Alas! Da Huo and Wu Bi are not reliable, I have to find an opportunity to fire them. ”

"The surveillance video should have nothing to do with the two of them." Deng Haoran said solemnly, with the majesty of a police officer in his tone. "But on the issue of work attitude, I think the manager needs to criticize education more."

"Yes, yes, yes! By all means! ”

"Manager, whose skateboard is this?" Long Xirui suddenly pointed to a four-wheeled street-style skateboard at the door of the property office and asked.

"Oh, my son's, he left it here after playing during the day."

"Can you lend me one?"

"Of course, you can use whatever you want."

I saw Long Xirui's right foot pedal, left foot on the ground, sliding quickly towards the door of the community, about to the door, her left foot suddenly stepped on the left side of the skateboard tail, the whole skateboard head high tail low side spinning and flying, the result came a 180-degree reversal, and finally "snap" a four-wheel landing on the ground, and Long Xirui has stood on the board with both feet, as steady as Mount Tai.

"I didn't expect you to be a skateboarder." Deng Haoran said, while trying his best to make his almost stunned expression disappear from his face as soon as possible.

This time, Long Xirui began to slide unusually smoothly from the door to the community, and when she was about to reach Deng Haoran, she asked, "Did you hear anything?" ”

"The wheels rubbing against the ground - that's the sound Da Huo described!" He said suddenly.

Before the words fell, Long Xirui had already stretched out his right hand and took his left hand, and then the whole person squatted on the skateboard and said, "Let's go, let's have a real interpretation of the case." ”

The two men held hands together, and he was so surprised and delighted that he could almost hear his own heartbeat. "You, I, Skateboard......"

"Now it's the victim, the murderer, the box."

After saying goodbye to the manager, Deng Haoran began to pull Long Xirui on the skateboard and walked forward along the path leading to the garbage bin. This section of the road is different from the entrance of the community, and it has been completely paved with a plastic runway, which is one of the reasons why many people such as Hua Cub like to come to this community to run. After walking a few steps, Deng Haoran's left hand felt a little laborious, so he changed to his right hand to pull Long Xirui. The journey was short, less than 2 minutes, and we were already near the dumpster.

Long Xirui jumped off the slideboard, grabbed Deng Haoran's shoulders to make him turn around, and then said, "Now the murderer is ready to leave." ”

Deng and Long walked back along the road they had come from, their skateboards in her hands.

"What did you find?" She asked.

He was already staring at the ground of the plastic runway. "Plastic materials still have a certain degree of plasticity, and they will leave some marks after contact with objects."

"Whoever walks through will leave a trace. This is known as Rocca's law. Long Xirui said, "By the father of forensics, Edmund? Rocca proposed that whenever two objects come into contact, there will be a phenomenon of transfer, that is, something will be taken away, and something will be left behind. ”

"Hmmm! If you look closely, it seems that there are traces of every footprint, as well as the traces of wheels, and there are at least two sets of wheel prints, the traces of skateboard wheels are narrow, and the distance between the two rows of wheel prints is also small, but the clearest, because they have just been left. The other wheel prints are too vague, but at least you can vaguely tell that the wheel prints are wider than those of the skateboard. ”

"You'll see better when you put it on." As she spoke, she took out a lens-sized thing from her pocket, turned it three times and folded it twice, and the thing expanded into a pair of sunglasses, and she twisted it between the two lenses, disassembling it in half, each with a lens and a frame, and she handed the left eye to Deng Haoran. "These are high-definition infrared glasses, which are super recognizable."

So, the two of them, each wearing half a pair of glasses, squatted down and used their backs to cover the light from the surrounding street lamps, carefully observed the ground, and moved step by step.

"It's a lot clearer, albeit with a lot of different imprints...... I think I found it! The wheel prints of the box used by Pissi feel that the distance between the two lines of wheel prints is almost the same, and if they are connected, you can roughly determine the route of the murderer. Deng Haoran looked happy, and then frowned again. But what's the use of that? That box was already in our hands, it was just a very ordinary box, and it was sold everywhere. We also tried to look through the box for clues about the killer, but apparently the cunning murderer was wearing gloves at the time and found nothing forensically. ”

"So what's the difference between a skateboard's wheel print and a box's wheel print?" She asked, seductively.

"The wheels of the skateboard are narrow, but the imprint is new!" He replied without thinking.

"Is that all?"

"Hey, the route of the wheel prints of the box seems to be symmetrical with that of the skateboard! What does this mean? Moreover, the two sets of wheel prints together are very similar to a narrow 'H' letter, except that the horizontal line is not in the center, the top and bottom are asymmetrical, half long, half short. ”

"Why is that?"

"The horizontal line of the letter 'h' is where I change hands, so the distance of the left hand is short, and the back part of the right hand is long."

"Why?"

"I'm used to using my right hand!"

"So ......"

"Oh! So the murderer is a left-hander! Deng Haoran realized that it was like a world away.

"That's why I said before that the murderer was not Da Huo or Wu Bi, you should remember that when the two had a verbal quarrel, Da Huo swung his right fist, and Wu Bi's hand that grabbed the chair was also his right hand."

"A left-handed orthopedic doctor!" He looked up at her and said, "I hope to get him out of the information God gave me tomorrow morning." ”

"There's more to it than that."

"Speak quickly!"

"When a person pulls the box forward, whether with the left hand or the right hand, the footprints are always in front of the side of the wheel print, and the two footprints in front of the wheel will change very regularly, that is to say, the group of footprints that can correspond to the wheel print is the murderer's footprints."

Deng Haoran pricked up his ears to listen, and his eyes focused on the plastic ground. He seemed to have found a set of footprints in front of the side of the box wheel print, but almost all the footprints were incomplete and fragmented. "I'm afraid the forensic personnel won't be able to get a complete footprint at all."

"I'm afraid so, but we can at least roughly judge the size of the footprint and the distance between two adjacent footprints." She said as she took off the bracelet on her left wrist and handed it to him. "It's exactly 12 centimeters long."

"Then the footprint is about 24 centimeters long." He measured several footprints in quick succession and came to a conclusion.

"If you calculate that the average person is 7 times the length of his feet, then the murderer's height should be about 1.68 meters - it seems that he is a short man, if the murderer is a man."

"Well, the distance between the two footprints before and after, representing the step distance, is also shorter than that of ordinary men." Deng Haoran said and suddenly recalled Gao Shilin's appearance, he was tall and burly, as if an orthopedic surgeon should be his size. "Left-handed, short, orthopedic surgeon, top surgery, we're about to spell out the full picture of this freak."

"Of course, if the murderer was just one person!"

As they spoke, the two of them walked back to the gate of the community unconsciously. At this time, Long Xirui squatted on the skateboard again, and this time, she grabbed his right hand with her left hand.

"I think the case needs to be repeated again. Let's get started, murderer. ”

So Deng Haoran pulled her up with his right hand, and in order to be more real into the play, he deliberately bowed his waist to make himself look more like 1.68 meters. "I'm left-handed, but I'm pulling the box with my right hand, so what is my left hand doing?" He said as he walked.

"The 'disappearing image' that we once thought might be related to the murderer's left hand."

"After a few steps, I finally switched back to my usual left hand."

"And by this time, the surveillance has not recorded any images."

"Maybe that's the truth. Let's wait for tomorrow to hear the Gospel of God! He said and looked at her with excitement on his face, "Do you know that although in the modern criminal investigation technology system, the ever-changing forensic technology is gradually replacing the previous logical reasoning and inductive deduction, but no matter what, no matter how high-tech technology is, it still needs a wise and shrewd mind to dominate and dominate." You have strengthened my conviction of this today. ”

She smiled faintly and said: "The truth is like a stone hidden in water, no matter how deep and turbid the water is, after all, water is water, stones are stones, clues are actually everywhere, as long as we don't let go of any clues, there will always be a day when the water will come out." She looked up at the lights on the 17th floor of Pishenglao's house and continued, "I believe the psychologist will also give us some clues." ”

It was Hua Xiao'er who opened the door for them. Soft and elegant piano music emanates from's bedroom.

"Shh Hua Cub put her index finger in front of her lips, then pointed to the bedroom, and said softly, "The psychologist said not to disturb them for the time being. ”

The two nodded silently.

A song "Canon" makes the atmosphere in the room seem peaceful and quiet. Deng Haoran's anxious and anxious mood was magically calmed down in a moment. If the clear mouth of the drink gave him a passionate vitality in terms of taste, then the sound of the wisps of the piano at this moment gave him a kind of pleasant and relaxed state in terms of hearing. In a hurry, he has feasted on the blessings of the ears, of course, accompanied by wonderful flowers, and the blessings of the eyes are even more enjoyable.

"Canon" stopped, and "Starry Night" rose again. At this time, the bedroom door opened, and a woman in purple walked out, her long hair was jet black, her face was shiny, and a pair of white-framed glasses were on the bridge of her nose, and the thickness of the lenses was even more unforgettable.

"Hello, I'm Deng Haoran from the Serious Crime Team. This one is Miss Long Xirui. ”

"Hello, my name is Xie Sangqiu."