Root cause

  I have to admit, when it comes to arguing, my talent is absolutely no match for his. Basically, I lose every time. The best approach is to ignore him or change the subject like I'm doing now: "Hey, didn't you realize from the start that Wu Yan wasn't murdered?"

  He gave me a bored look: "Can't even you, with your wooden brain, figure out the problem that's stumping me?" Before I could respond, he continued: "A person falling from the bottom floor wall, one meter away, face up, holding a little girl, can only be in one situation: both feet hanging outside the balcony, body slightly tilted forward, falling with a slight angle deviation. If the person was pushed from the balcony, then the body would mostly be leaning back, with a distance of one and a half to two meters between the body and the wall, and when hitting the ground, it would be at an angle of sixty degrees to the left or right, causing severe skeletal damage and a clear lateral deep depression on the ground."

  I can only describe it with astonishment, can the two methods of falling from a building be so accurate? That night I saw him appear at Wu Yan's fall location on the upper floor, in fact he was just going to observe these things, and at that time the answer was already in his heart.

  "If you found out early, why didn't you speak up?"

  "I've already said."

  "When did you say that?" As soon as I asked, I realized that he had indeed said it earlier. In the conference room, he listed two people who were not the murderer but were present at the scene, and didn't make a psychological portrait of the real murderer again. At that time, except for him, probably everyone else just thought there was another murderer, unaware that there was no real murderer at all, everything was just Wu Yan's self-directed performance, or it could be said that Du Xiangyuan and he were manipulating a double-layered play together.

  No one could have imagined that so many secrets were hidden behind it.

  I looked at him and asked the question that had been bothering me for a long time: "How did your brain grow? How can you even know the angle of falling from a building so accurately?" Gaoting glanced at me sideways, "I also want to ask you this question, didn't you pass physics class in school? Don't you know how to calculate simple free fall motion and spatial distance?"

  "...felt like they were purely looking for trouble and volunteered to be at his disposal."

  But he saw his brow furrow and said: "However, it seems that there is no answer to this matter."

  "What's wrong?"

  He lightly uttered two words: "Root cause."

  After a moment of stunned silence, he immediately realized that he was referring to the unexpected event that led to Wu Yan, Yu Xiuping and Du Xiangyuan's "psychogenic mental disorder". He glanced back at the police station behind him and muttered: "It should be possible to interrogate it out."

  Gao Cheng shook his head: "He won't say it. When something has sunk to the bottom and become a heart demon, it becomes an eternal secret."

  I don't quite agree, I think it's: "As long as something exists, there is a way in, and even the deepest secrets can be dug out." Aren't Wu Yan and Du Xiangyuan the best examples? "Believe in the police, Zhang Ji and his team will definitely make him talk." The deterrent power of the cold-faced detective captain Zhang Ji is still evident.

  Gao Cheng sneered at him with disdain.

  Two days later, I received a call from Xu Jianglun. I thought he was going to talk about the case, but instead, as soon as he came on, he said: "Xia Zhu, Du Xiangyuan is dead."

  After hanging up the phone, my mood was still unsettled. I opened the bedroom door and saw Gao Cheng still quietly reading in the living room, seemingly very interested in books. After he entered my house, he had flipped through almost all of the books I collected, and now he was holding the script for the illustrated stage play I made this time.