After leaving the graduate dormitory building, the two decided to go to the scene again and walked towards the psychological department building.

"Xiao Zhan!"

When someone shouted behind him, Zhan Zhao and Bai Yutang turned around at the same time.

I saw a middle-aged man in a white robe and glasses, about forty years old. He ran a few steps to catch up with him.

"Doctor Xu?" Zhan Zhao recognized Xu Ting, a school doctor at C University.

Xu Ting ran to the front, looked up and down for a while, and then smiled and said, "It's him?"

Zhan Zhao smiled a little embarrassedly. He knew that Dr. Xu liked to spread some trouble the most, but now, he was really not in the mood to care about some things.

Xu Ting didn't notice the strange expression on Zhan Zhao's face, and continued to smile and said, "Dr. Zhang just came to the infirmary with Lao Xu. The old man was so angry that he was panting and trembling all over! We doctors thought he was going to be unable to do it."

"Are Professor Xu okay?" Zhan Zhao asked anxiously.

"It's okay! I've recovered. I've sweated. I've been working here for twenty years and haven't seen the old man as arrogant as he has!"

Hearing this, Bai Yutang blinked at Zhan Zhao with a smile, meaning "That old man is not dead, he is lucky!"

Zhan Zhao glared at him fiercely.

Xu Ting wanted to continue talking, but the two of them were no longer patient and said that there was still something to do. Zhan Zhao and Bai Yutang turned around and left hurriedly.

In a blink of an eye, I walked downstairs to the psychological department building.

Zhan Zhao looked up at the roof and saw that the guardrail outside could hardly be seen clearly under the strong light.

"Xiaobai, are you too outrageous? Can you see clearly this way?"

Bai Yutang said proudly: "What is this? The young master's dynamic vision is ranked first in the entire air force. Not to mention a railing, we can see clearly when the shells fly over!"

Zhan Zhao glanced at him and saw the white mouse proudly, even his tail was raised.

After borrowing the telescope from the policeman's hand, Zhan Zhao looked up carefully.

After a while, Zhan Zhao frowned, "Nothing is right!"

"What's wrong? What's the matter?" Bai Yutang took the telescope and looked like it.

"Have you noticed that the direction of the guardrail is not right?" Zhan Zhao asked Bai Yutang.

Bai Yutang put away his telescope and looked at Zhan Zhao: "You said this, indeed! If Li Feifan fell down because he leaned against the damaged guardrail, then the guardrail should be turned outward. Even if Li Feifan pulled the guardrail before falling down, he should be turned outward first and then folded down! But here..."

"That's right!" Zhan Zhao interface, "The guardrail here is almost vertically downward, and there is no tendency to turn outward!"

"Maoer, I have an idea!" Bai Yutang said suddenly.

Zhan Zhao also said: "So coincidental? I have an idea too!"

The two of them looked at each other with a clear smile, and then walked into the building.

This time, they did not go to the rooftop, but to the first floor below the rooftop, which is the top floor of the Psychology Department Building - the 13th floor.

Since the Psychology Building of Large C is just built and put into use, not all floors have been renovated. The 12th and 13th floors on the top floor have been idle, with some raw materials piled up, and even the doors are not installed.

The two walked along the corridor and looked over one by one. In front of the door of the fifth room, they saw the guardrail hanging upside down outside the window.

Zhan Zhao grabbed Bai Yutang, who was just about to go in, and pointed to the door number above the door frame - 13--5

Bai Yutang said in surprise: "135?"

Zhan Zhao nodded! It seems that he has found nothing wrong!

The two of them walked into the room carefully along the wall and saw that the ground was very messy and dusty, as if they were deliberately scratched. Although there were no footprints, it was obvious that someone had come.

When the two walked to the window, they saw the guardrail less than one meter away from the windowsill. Bai Yutang took off his windbreaker and handed it to Zhan Zhao, turned around and walked out. Zhan Zhao grabbed him and said, "What are you doing? This is the 13th floor, it's not a joke!"

Bai Yutang smiled and shaved his nose: "Silly cat! How could he be afraid of heights!"

Zhan Zhao was a little embarrassed: "Why don't you call a few more people to come and take some safety measures..."

Bai Yutang had already released the buttons of his collar and cuffs with a smile, and knocked Zhan Zhao's chin with his fingers: "Don't worry!" After that, he quickly walked out of the door and ran towards the rooftop. Zhan Zhao had no time to shout, "Be careful!" The man was gone, and he could only wait anxiously with his clothes at the window.

After a moment, Bai Yutang climbed the guardrail and went down to the windowsill. Zhan Zhao was frightened and was about to pull him, when Bai Yutang shouted: "Cat, let's flash to the side."

Zhan Zhao subconsciously took a few steps to the side. Bai Yutang shook a few times in the air, jumped in cleanly from the windowsill, landed steadily on the ground, patted the dust on his hand.

Zhan Zhao was so angry: "You can't stop thinking about being handsome?"

Bai Yutang shrugged: "I am very handsome!"

"You..." Zhan Zhao was so angry that he couldn't take the words that he could only glar at him with his cheeks. He knew in his heart that Bai Yutang used this dangerous action because he was afraid of destroying the clues that might be left on the windowsill. Although he knew that he had always been desperate when handling the case, he was still so shocked that he almost jumped out of his heart when he saw it with his own eyes."

Bai Yutang finished taking pictures of the gray and said, "In this way, the rooftop door was locked from the outside, which makes it understandable, but I still can't figure it out."

Put on the windbreaker and said while turning over the lapel: "If the murderer pushed Li Feifan down first and then climbed down the guardrail, the time would be too hasty, and it would be impossible for him to have no witnesses!"

Zhan Zhao nodded: "Indeed, we rushed out of the building at the first time and didn't see anyone! And it was too risky to see everyone. Unless..."

"Unless what?" Bai Yutang looked at Zhan Zhao in confusion.

Zhan Zhao looked at the guardrail outside the window: "Unless Li Feifan did not fall from the rooftop."

Bai Yutang was stunned and then suddenly realized, "Yes! My door was misled by the guardrail! He was thrown out from here! The murderer might have made the guardrail like that last night, in order to create the illusion that Li Feifan locked the door himself!"

Zhan Zhao nodded: "Often people don't look up at it! And even if they look, they can't see clearly!"

Bai Yutang looked around: "In other words, this is the first murder scene! But the murderer was really bold. After throwing Li Feifan downstairs and coming out from here, he may be discovered or suspicious... And why did he take such painstaking efforts?"

Zhan Zhao pondered for a while, his face feeling a little embarrassed.

"Cat, what did you think of?" Bai Yutang knew that he must have discovered something when he saw his expression.

"...If you consider the criminal's psychology, he will definitely have a purpose in doing this, but it will be more obvious!"

"How do you say it?" Bai Yutang listened to Zhan Zhao's professional analysis with interest.

"This murderer took great pains to cover up the scene of the crime! The purpose of forging the scene of the crime is nothing more than to create a proof of the absence for himself!"

"Yes!" Bai Yutang nodded.

"The so-called absenteeism proof is actually to rule out the possibility of appearing at the crime scene at the time of the crime!" Zhan Zhao continued, "If the time of the crime is divided according to the logic of the murderer, then the entire incident is divided into four sections! That is, 'Li Feifan entered the building, was killed by the murderer, fell from the building and was found, and the murderer left!"

"That's right!" Bai Yutang touched his chin and listened seriously.

"The order of the first two paragraphs, that is, the order of being killed after entering the building is impossible to tamper with!" Zhan Zhao continued patiently, "However, the last two paragraphs, that is, falling off the building and leaving the murderer, can tamper with it!"

Zhan Zhao said this and paused for a moment, allowing Bai Yutang to digest these words. His extremely high understanding ability made Bai Yutang understand what Zhan Zhao meant immediately: "I understand, that is to say, the murderer left the scene first, and Li Feifan fell down. Most people think that the murder and the fall of the building occurred at the same time, but in fact, it may not be carried out at the same time! As long as the murderer left here before Li Feifan fell down, he could see him elsewhere, and then let Li Feifan fall down! Then he had sufficient evidence of absent, and it would eliminate the suspicion!!"

Zhan Zhao nodded with satisfaction. Bai Yutang was indeed smart. Not only did he understand his ideas, but he also followed his ideas.

"However, the set of numbers 135 became the key!" Zhan Zhao continued, "This set of numbers directly points out the scene of the murder and exposes the murderer's intentions! In other words, this set of numbers was indeed written by Li Feifan himself!"

Bai Yutang pondered for a while: "In other words, after the murderer left, Li Feifan was not dead yet, but he could no longer save himself. The only thing he could do was leave this set of messages!"

Zhan Zhao looked at the windowsill and the guardrail outside the window, and suddenly said, "When you jumped in just now, I suddenly thought of something."

Bai Yutang looked out along Zhan Zhao's gaze, "You mean... can someone be installed between the windowsill and the guardrail?"

Zhan Zhao said bitterly: "Maybe...Li Feifan just briefly lost consciousness and was then put on it."

Bai Yutang patted Zhan Zhao's shoulder comfortably and sighed, "As long as he wakes up and moves his body, he will definitely fall down, and the moment he falls, he leaves us this message."

"It's so cruel. He's just a child. Who wants to harm him like this?"

Seeing the bitterness on Zhan Zhao's face, Bai Yutang pulled him over, leaned on his shoulder, and said slowly: "Maoer, you can't do this job alone!"

Zhan Zhao's body trembled: "Two people?"

Bai Yutang gently stroked his hair: "You have already thought of it, right? After Li Feifan entered the building, before he fell from the building, two people came out of the building at the same time..."

"Professor Xu and Dr. Zhang..." Zhan Zhao said in a little confused: "In theory, it is indeed... just."

"Cat!" Bai Yutang held Zhan Zhao's face and stared at his eyes and said seriously, "Do you still remember what Dr. Xu said just now?"

Zhan Zhao opened his eyes wide in surprise and said helplessly: "He said, Professor Xu was sweating all over his body..."
Chapter completed!