The teaching building is six stories high. The three of them climbed to the stairs on the sixth floor in one go. The way to the rooftop was blocked by a door with a heavily locked iron chain wrapped around the door handle.

Wu Dao took the mobile phone from Yunxing's hand and said softly to the screen: "Heizai, please adjust the surveillance on the sixth floor. This door has always been locked or was locked after the incident."

"Okay!" Hei Zai responded.

Yunxing continued to pick the lock, and the iron door blocking the way was pried open by a hair-thick iron wire.

"Creak-", the iron door let out a piercing scream, causing the three of them to tense up and hold their breath at the same time.

Yunxing opened the door with force, and a cool breeze hit her face with a soft sound. She looked in front of her and walked in cautiously.

Zhang Qi patted his chest and exclaimed: "I'm scared to death!"

Wu Dao breathed a sigh of relief and secretly laughed at his timidity. He knew there was no danger but was so cautious, so he relaxed his nerves and walked in openly.

The three people stood on the edge of the rooftop and speculated that where Zhang Lan jumped from the building, there was a one-meter-high cement wall surrounding the rooftop.

"Master, that iron gate was there before Zhang Lan jumped off the building, but there was no surveillance on the day she jumped off the building!" Hei Zai's voice rang from the cell phone in Yunxing's hand.

"Can you recover?" Yunxing stepped on the wall and looked at the rooftop.

"No, I tried it. It was not a deliberate deletion, but there was no video at all. That means the surveillance was not working on the day Zhang Lan jumped from the building." Heizai replied.

Yunxing frowned: "Check whether there was a power outage in this area that day."

"I checked, no!" Hei Zai replied.

"Where's the school? Is there any record of the power outage?" Yunxing pulled away and looked downstairs.

"Wait a minute, let me check!" There was the sound of typing on the keyboard, and there was also an electronic sound of "Welcome".

Wu Dao looked at the school's security room: "If there is no power outage in this area, then the school's power outage is worth considering."

Zhang Qi stood next to Yunxing: "The investigation file says that the circuit breaker tripped after school, but it didn't say when the call came."

"That's such a coincidence, the circuit breaker tripped at that time!" Yun Xing raised his eyes and looked at Zhang Qi, with an expression on his face that seemed to be a smile but not a smile.

"It's just something fishy. What a coincidence!" Zhang Qi sneered.

Wu Dao looked at the two women: "We can't find anything here, we still have to visit."

Yunxing turned around: "Let's go back and ask questions one by one from the list tomorrow."

Hei Zai narrowed his eyes as he looked at the three people who came back. Wu Dao and Yun Xing were not investigating the case recently. He was so tired of being alone in the store tonight. Not only did he have someone to accompany him tonight, but he could also get off work early. Not to mention how happy he felt.

Yunxing distributed a list to everyone, and then divided the work according to gender. Wu Dao and Hei Zai visited female classmates, while she and Zhang Qi visited male classmates.

Hei Zai held the list and giggled. Wu Dao looked at him playfully, gloating that he would not be hit tomorrow.

There was no talking all night, and the first ray of sunshine appeared in the sky. Four people had already appeared at the corresponding places according to the addresses on the list.

Wu Dao stood in front of the breakfast stall with pancakes in one hand and soy milk in the other and looked at the entrance of the community. The first student he visited was a student who was relatively poor in study in the class. He felt that this kind of student was not bad in other aspects except studying.

A female student with short ear-length hair, a round face, and a little chubby walked out of the community with a schoolbag on her back. When Wu Dao saw her, she immediately stuffed the remaining pancakes into her mouth, then sucked up the soy milk in the cup and removed the package.

He threw it into the trash can and immediately chased after it.

"Hello classmate!" Wu Dao slowed down beside the female student.

The female student stopped and looked at him doubtfully: "Who are you? Who is your classmate?"

Wu Dao smiled and replied: "Me, police officer from Xincheng District Police Station, your name is Lin Xiaoping, right?"

"Oh, police, yes, I am Lin Xiaoping, what do you want from me?" Lin Xiaoping said and continued to walk forward.

"Zhang Lan didn't commit suicide, right?" Wu Dao looked into her eyes.

Lin Xiaoping suddenly stopped and looked at Wu Dao: "Isn't it all done? Why check again?"

"Because the family thinks it's not a suicide, we have to check again!" Wu Dao replied with a smile.

"I'm not familiar with her, you'd better ask someone else!" Lin Xiaoping avoided Wu Dao's gaze and continued to move forward.

"I just asked other classmates before looking for you. They said that your relationship is not bad." Wu Dao followed Lin Xiaoping.

Lin Xiaoping stopped again and glared at Wu Dao angrily: "Who told you that I have a good relationship with her? I almost don't talk to her."

Wu Dao shook his head: "I can't tell you this. Saying it will affect your friendship as classmates."

"I really don't have a good relationship with her. We basically haven't spoken to each other in class." Lin Xiaoping continued to walk forward. After explaining, she added: "I don't know why she jumped off the building. I didn't know until the next day in class. It felt pretty good."

Unfortunately, it’s very uncomfortable to sit in the classroom!”

"Then who in your class has the best relationship with her?" Wu Dao asked, avoiding the oncoming pedestrians.

"Ask Tan Shuang, they are often together!" Lin Xiaoping said and ran away: "I won't tell you anymore, the bus is coming!"

Wu Dao stopped and watched her get on the bus. When the bus went away, he took out his mobile phone. The name Tan Shuang was not on the list, so he quickly called Hei Zai.

"What's going on?" Hei Zai sounded like he was in a bad mood.

"Have you seen Tan Shuang?" Wu Dao asked.

"No, what are you doing?" Hei Zai's tone was a bit harsh.

"It's okay, I just wanted to ask!" After Wu Dao said, he hung up the phone, put on his cell phone and ran to the roadside with his hand to hail a taxi.

"I don't know, I didn't know until the next day in class!" A boy looked at the passing cars with a meat bun in his hand.

Yunxing looked at the boy: "Aren't you in the same class? Don't you know what happened to her?"

"I don't know, I don't play with her, and I don't have a good relationship with her!" The boy looked at the passing bus and moved forward and took out his mobile phone.

Yunxing was a little depressed, thinking that she could easily win over a young boy with her beauty, but the other party didn't know anything about her and didn't ask anything.

"Little bastard, if I had asked you to bow down to me before, you still dare to ignore my answer. I'm spoiling you!" Zhang Qi glared angrily at the bus that was driving away.

Hei Zai sat on the side of the road depressed, sighing as he looked at the passing cars. He ran away as soon as he said hello to them, and shouted for help at the same time. If he hadn't run fast, he would have been beaten.

He stood up and patted his butt and walked to the roadside to hail a taxi. It was better to go to a convenience store. All the beauties were rushing to talk to him.

When Wu Dao arrived at the school, the school gate had already been closed. He could only look at the school gate and sigh helplessly. He got up early to catch a late meeting, and only visited one person in the morning. At this rate, it would take half a month, and it seemed that he would have to spend noon and evening.
Chapter completed!