(Thanks to "sp55aa" for the rewards)

When a group of people left the General Affairs Building, the night had already covered the entire campus. White ball street lights were mixed with shadows and guided the road. When you looked up, you could see the faint sky above the treetops and a crescent moon. Not far from the crescent moon is dotted with a bright and thorough star. .

Teacher Shen sincerely invited Director Wu to dinner, but Director Wu refused. He joked that the yellow-faced woman was still waiting for him at home. If she went to dinner with a beautiful girl like Teacher Shen, she would have to kneel on the washboard when she got home.

After saying that, Director Wu said goodbye to Teacher Shen without any reservation, walked straight to the parking floor behind the General Affairs Building, and got into his black accord.

The four continued to walk along the Linyin Road to the fountain not far from the school gate. Chen Youyi stopped and her car was parked in the parking lot on the other side of the teaching building, so she had to go to the right. As for Cheng Mo and his friends who want to leave school, they have to go left.

Just now, Chen Youyi also called Cheng Mo, Fu Yuanzhuo and Yan Yitong for dinner, but everyone felt that it was a little late, so Chen Youyi did not force it. It was time to part ways at this moment.

"I'll go to the parking lot to get a car. You guys can go back quickly! Don't stay outside!" Chen Youyi turned his head and said to Cheng Mo and the other two.

Chen Youyi's voice was not very loud, and he had a slight tremor that was not easy to detect in the cool night wind. Cheng Mo noticed that Teacher Shen looked at the deep and twisted passage, and his expression was a little subtle and unnatural.

However, only those who are used to observing others can notice this abnormality. Fu Yuanzhuo and Yan Yitong had no feelings at all. The two nodded to Chen Youyi and said "Okay", then waved and said, "Goodbye Teacher Shen, Mr. Shen, and said, "Goodbye Mr. Shen," !”

Cheng Mo also said "Goodbye Teacher Shen", and followed Fu Yuanzhuo and Yan Yitong to the school gate with a slow step. When Teacher Shen's light footsteps were about to disappear, he turned around and looked at Teacher Shen's back. It has disappeared at the end of vision.

Cheng Mo hesitated for a moment, stopped to deal with Yuanzhuo and Yan Yitong and said, "You guys go back first!"

Fu Yuanzhuo and Yan Yitong both looked at Cheng Mo with some surprise. Fu Yuanzhuo asked, "What's wrong? What are you going to do?"

"I have something to ask Teacher Shen," Cheng Mo said.

Yan Yitong turned around and was about to walk towards the teaching building, "Then let's go together!"

Cheng Mo quickly grabbed Yan Yitong's arm, "Don't go, there are too many people, I'm afraid Teacher Shen will not be convenient for him to say."

Fu Yuanzhuo instantly made up the reason and suddenly said, "Oh! Yes, you are asking Teacher Shen that has a bad relationship with those teachers in private, right? These questions are indeed a bit hard to say when there are many people."

"You two should go back quickly! See you tomorrow." Cheng Mo turned around and walked quickly towards the teaching building. He didn't say yes or no, but he gave people the feeling that he was just a default.

Yan Yitong pouted, amplified the volume slightly and shouted: "Cheng Mo, see you tomorrow. Remember to send a message if you have anything to do."

Cheng Mo did not look back, but just raised his hand and shook it in the air.

Yan Yitong looked at Cheng Mo's back and asked Fu Yuanzhuo with some concern: "Chen Mo and Teacher Shen won't really meet the weird guy who painted chalk, right?"

Fu Yuanzhuo hesitated for a moment and said, "Is this a possibility not very high?"

"What if? Should we secretly follow and protect Teacher Shen and Cheng Mo?"

"If you are discovered, it would be too embarrassing, right?" Fu Yuanzhuo said with a bitter face.

"What's the embarrassment?" Yan Yitong asked in confusion.

Fu Yuanzhuo didn't know what to say, "It feels like he was catching a traitor?"

Such words were so disrespectful to Teacher Shen and Cheng Mo, so he could only sigh and said, "As long as you go, you can do it."

Chen Youyi walked alone on the concrete road with swaying trees. There was no light in the teaching building with white tiles not far away. It was as silent as the scene of murders that often appeared in mystery novels. I thought of the videos I just watched and Wu Director's words, Chen Youyi shivered in the cool breeze, couldn't help but put his hand into the small shoulder bag around his waist, and touched the electric shock device.

The sycamore tree beside him shaking and made a serene sound. Chen Youyi, who was a little scared, quickly turned his head and looked at the sycamore forest next to him. The place near the pale street lights was empty, but the depth was dark. What I can't see clearly either.

Chen Youyi felt her hair shivered, as if something was lurking inside, and she was observing her secretly with her empty eyes. She turned around and quickly walked towards the teaching building. In order to comfort herself, she whispered to herself: Remember this feeling. Next time you write these gloomy scenes, you can use them.”

When he walked through the ramp next to the football field and arrived at the teaching building, Chen Youyi couldn't help looking in the direction of the classroom, and subconsciously looked directly at the location of Class 1 (9) in high school, the long corridor. There was no trace of light inside, and even the outline of the glass window could not be seen clearly. Ten chalk drawings from last school year appeared in this classroom.

Chen Youyi subconsciously looked up at the second floor of Class 2 (9) on the second floor. The white tiles were shining with dim light under the moonlight. She was wondering what the chalk painting that Cheng Mo wiped it away. ?

Chen Youyi looked up at the teaching building in the dark from bottom to top, and felt that it was completely different from the daytime. It was lost in energy and energy. It looked like a bright animal nest on the outside but rotten inside, a huge mother nest that devoured youth and simplicity.

At this moment, Chen Youyi felt a little sad inexplicably. This sadness covered up his fear, so that she ignored that she had stopped and stood in front of the teaching building that originally made her feel a little scary.

"Teacher Shen, what did you see?" A light voice suddenly floated out of the quietness of the deep sea.

Chen Youyi seemed to be startled. She quickly took out the electric shock from her bag, held it with both hands, turned around immediately, holding it, pointing to the place where the sound was made, "Who?"

Cheng Mo, who was standing at the top of the ramp, quietly looked at Chen Youyi, who was covered by a street lantern. The white light ball stretched out her shadow, "It's me, Cheng Mo."

Before Cheng Mo's words could be finished, Chen Youyi's defensive posture relaxed. She put the electric shock back into her bag, lost a breath, and smiled a little shyly, "Sorry, I heard Director Wu just now He was a little nervous." After a pause, Chen Youyi asked in confusion: "By the way, have you been back with Fu Yuanzhuo, Yan Yitong and the others? Why are you here again?"

"Oh! I wanted to ask Teacher Shen a few questions, so I caught up with him." Cheng Mo said lightly.

"Is it something about mysterious chalk drawing?"

"Um!"

"Actually, I don't want to talk too much when I know." At this time, Chen Youyi's tone of speaking also became relaxed, and there was no sense of tension at the beginning.

Cheng Mo walked up and walked along the main road outside the teaching building side by side with Shen Youyi towards the side building. The parking lot was next to the side building.

"Student Cheng Mo, what do you want to ask? Teacher Shen must know everything and say everything!"

"Teacher Shen, you also like to read mystery novels. Have you never studied this strange event?"

"Of course I have studied it. For a month, I still held the college doctor and stayed in the school with me, trying to catch the boring person, but it was a bit embarrassing! I said confidently that I wanted to solve the case, but I even had a clue at all. No discovery”

"No clue was found at all?"

"Actually, this incident also hit my confidence in writing mystery novels. I knew that the other party must have used some tricks and created an "impossible secret room", but I just couldn't crack it. Maybe I'm really not suitable for the manuscript. Let’s make a mystery novel!" Chen Youyi said in a low tone.

"Don't be discouraged! Sister Xi, the so-called secret rooms, but there are only a few, such as the unreasonable type in Poe's "The Murray Street Fellowship"; the bag-drop type in Seiichi Morimura's "The Blind Scene of the High-Levels"; Like the spatial geometry in Kaneda's "Lucia's Doll Murder"; like the psychological effect in Agatha's "Sin in the Sun"; like the Reasoning of Jiro Akagawa's "The Reasoning of the Three Color Cats" Reverse thinking type and special skills type in "Missile Mechanism House Murder"

"We eliminated several impossible items based on geographical factors, and only psychological effects and special skills are left."
Chapter completed!