The villain is trapped in the system and begs me to let him out [Moriarty who worries about the coun

In the evening, Bei Yu University was shrouded in an intoxicating blush, as if the entire sky and clouds were soaked in clear wine.

William and Du Ruoying sat opposite each other at a window position in the cafeteria, and their attention was attracted by the sunset and lake view outside the window from time to time.Wang Fanfan and others sat at a table behind them, and they were chatting about the fire in the department hall.

Probably because they didn't realize that Du Ruoying was nearby, one of the girls said very loudly to the others: "Don't you really think that hypocritical Du Ruoying is suspicious? When the fire broke out, she clearly She was dating that Professor William in Yuta, but she was able to call the fire alarm in time, which is too strange! I think, maybe she caused the fire at all."

"A self-directed and acted fire for a scholarship? There is such a thing..." The others were obviously convinced, and they all joined in.

"It's really too much to spread rumors and slander you like this." William pretended to sigh at Du Ruoying with some gloat, "Obviously thanks to you calling the police in time, you managed to prevent more serious casualties and property losses, but such a legitimate act of kindness was ignored by them." It became a self-directed and self-acted conspiracy. It reminds me of a passage I read somewhere before—"When you want to be a good person, you will become a villain in the eyes of another group of people."

"But their guesses are not unreasonable," Du Ruoying looked very calm, "If I were them, I would definitely think the same."

"Oh? You can think about it." William lowered his eyelashes and unhurriedly rolled up a strand of pasta. "So, in order to clarify the truth as soon as possible, when shall we go to the scene?"

"Then let's go after dinner. After seven o'clock, there will be no one in the building," she said.

"However, having said that, why does Xiaoying think there is something hidden behind the fire? In fact, I went to the journal reading room this afternoon to check, and all the news said that the fire was just an accident."

"I know, they all said that there was a hot-melt glue gun in the college that forgot to unplug the socket, the glue gun continued to heat for a long time, ignited the PVC boards piled up on the side, and then burned the curtains, which eventually led to the fire. During the evacuation, no one noticed that a mentally abnormal grandfather sneaked in next to the room where the fire broke out, so he became the only victim. It seems that it is true—”Du Ruoying said, "However, if such a fire accident occurs, do you know what the actual probability is?"

"Oh? How much is it?"

"Zero," she sighs, "We teach that there are people who use hot glue to make models, but there's no way they'd be stupid enough to put a hot glue gun on a PVC sheet because it would burn the sheet. More importantly, the softening point of the hot melt adhesive is around 65c to 135c, so the temperature that the glue gun can reach generally does not exceed 180c, while the ignition point of the PVC board is 256c - that is to say, the hot melt glue gun is not enough To ignite the PVC board." [1] 7K 妏敩

"However, as long as there is some circuit failure in the glue gun, it is not impossible to reach the ignition point." William's tone sounded a little casual, and he was not so much asking her as he was deliberately testing her.

"That's the problem," Du Ruoying said. "The PVC boards in the classroom were ordered from the Internet when our class started, and the style was chosen by me. The full name of the one we bought is PVC Freedom." Foam board, also known as flame-retardant PVC foam board, is a fire-resistant material. Even if it reaches the ignition point, it will immediately extinguish itself, and there will be no open flame at all, let alone burn the curtains. "[2 ]

"So, someone deliberately arranged it like this to make the fire look like an accident?" The corner of his mouth slightly raised, showing a satisfied smile, "Then what do you think the purpose of the arsonist would be?"

"I haven't thought about it yet."

"Then try to think about it."

"Hmm... I don't think there should be anything in our classroom that is worth taking so much trouble to burn. Could it be to murder that mentally disturbed old man?"

"The intuition is quite accurate, classmate Xiaoying."

"But who would murder him? It doesn't make any sense." Du Ruoying obviously didn't believe her guess, "As far as I know, although he has a son who treats him very badly, and often drives him out But the pension he receives every month should be enough to ensure that his son does not want him to die. As for the other people he contacts, they are nothing more than teachers and students in the school. who will kill him."

"However, think about it. Your department building has access control, not to mention that the professional classrooms on the fourth floor have been locked recently. It may not be easy for that ragged old man to sneak in."

"That's true, so it can only be that someone secretly brought him in...Wait, you said access control—could it be someone from our college who did it this time?!" white.

This is too cruel, she doesn't want to go through a case like Gu Yue's again.

However, William didn't seem to intend to give her time to calm down. He slowly stood up from his seat, and in the gentlest voice, said the words that hurt her the most: "Let's go, classmate Xiaoying, let's go together Go to the scene and see what the truth you are longing for is."

"Before then," she forced her emotions to return to calmness, "we have to prepare cigarettes in advance. In case of unfortunate encounters with patrolling security uncles chasing people away, we can still deal with them."

"Can a cigarette solve it?"

"It's more than enough," she smiled confidently, "Don't worry, the security guards are very talkative."

"However, compared to cigarettes, I think there is one more important thing to prepare in advance."

"Oh, what is it?" she asked curiously.

However, he just raised his hand and slightly bent his fingers twice, motioning for her to come and listen.She had to do it.

After listening to his suggestion, she couldn't help but nodded with some conviction: "Indeed, in case you meet the real culprit, this will be a good tool to verify the identity of the other party."

"Yes."

In this way, taking advantage of the hazy night when it was getting dark, the two came to the department building of the School of Architecture.There is no one in the huge entrance hall, only the smooth clam-colored tile floor silently reflects the hazy reflection.Standing in the center of the hall, you can clearly hear the hissing sound of the indoor fountain behind the screen wall, and the clear echo it arouses.

On the left side of the hall is a spiral staircase with a steel structure, and on the right side is a circular security booth made of glass, inside which sits an uncle security guard who looks to be in his fifties. He glances up at the two visitors The reader took a look, and then continued to look down at the phone.

The two of them went up to the fourth floor without hindrance.

The corridors of the college at night look even more terrifying than during the day.Looking inside through the cordon, only a chaotic black color can be seen.

Du Ruoying turned on the flashlight and shone in. The pale beam of light quietly swept across the corridor. Everything looked the same as what she saw in the morning, but the chill that emanated was even stronger.

Seeing that she seemed to hesitate, William took the lead and walked in through the cordon.

"...?!! Hey, wait for me!"

Hearing her call, he suddenly stopped in his tracks, and she bumped into him who was caught off guard.

"Oh? Are you scared, classmate Xiaoying?"

"I, I'm not afraid."

However, he just turned his hand back calmly, and then grabbed her wrist, as if catching a current thief: "If you're not afraid, why are you secretly holding on to the corner of my clothes?"

"...It's just a conditioned reflex, who told you to run so fast!" She wanted to pull her hand out, but he held her tightly.

"Yes, the voice is very confident, but it's a pity - the control of the pulse needs to be strengthened," his tone was full of teasing and sarcasm, "it's hard to believe that you are not lying if the beating is so fast." He let her go suddenly, and walked further into the darkness.

"You... leave your polygraph skills to the arsonists. It won't work with me." Du Ruoying protested dissatisfiedly, "Hey, don't go so fast!"

"Is my name 'Hello'?" Seeing her hurriedly following her and grabbing the hem of his clothes again, William couldn't help chuckling, "Why don't you dare call me Will tonight? It's because I'm afraid." Are you afraid of the drawbridge effect?"

"That's not true!" she quibbled. "Anyway, 'Hi' and 'Will' sound similar, don't you think it's easier to call it that way?"

"……do not think so."

Next to the most intensely burned room, the two came to the position marked by the corpse line.With the help of the dim light of the flashlight, William scanned the surrounding shoe prints, and then asked, "Have you been here during the day?"

"Yeah, I came here in the morning."

"I see, did you meet your brother here?" He mused, "What did your brother say?"

"He showed me the autopsy report. The corpse was indeed killed by inhaling too much poisonous gas produced by the burning of PVC. His lungs were also severely festered by the scorching air. Most importantly, his death time was also related to the fire. The timing matched."

"Has any drug been detected to cause coma?"

"Although not, but - a high concentration of alcohol was detected in the blood."

"Understood," William came to the collapsed door, leaned over and picked up a scorched and severely deformed lock cylinder, "It seems that the murderer took advantage of the time when no students came to teach all night at the end of the semester, and waited for an opportunity to kill the old man. tricked him into this house, got him drunk, locked him up and burned him to death."

"Unfortunately, the door lock has become like this, I'm afraid it can't support our conjecture." Du Ruoying sighed a little disappointed.

Then the two went to check the classroom where the source of the fire was located.

Next to the socket in the back row of the classroom, William reached out and picked up a handful of ash particles from the surface of a pile of solidified asphalt-like waste, and carefully crushed them with his index finger and thumb. Wood-colored dust immediately mixed together.

"So that's it... Did you sprinkle sawdust on the PVC board, so that you can easily create an open flame." He patted the dust on his hands, then got up and said, "Take a look at the wall, I want to confirm whether there is a line of fire here." dividing line."

"The dividing line?" Du Ruoying turned the light in the direction he was pointing in confusion.

William picked up a strip of charred wood that fell from the window frame, and drew several long vertical lines on the wall. The surface of the wall became brittle due to severe burns, and once a little force was applied, the underlying layer could be peeled off. Layers of black ash.Therefore, wherever the wooden strips pass, there are grooves of different depths on the wall. These changes in depth are very regular, and it can be vaguely seen that there are several horizontal dividing lines.

Without waiting for William to explain, she immediately understood: "The depth of these vertical grooves is divided by several dividing lines, which shows that the distribution of the degree of incineration is unnatural - some of the walls have been splashed with things. !"

"To be specific, some of the curtains were splashed with something." William smiled. "Imagine the original position of the curtains and their height. Does it fit well?"

"But... it was not detected at all. Could it be that it was splashed with alcohol or something?"

"It's possible." William nodded. "The last thing is the hot-melt glue gun that has been modified with a high probability. As long as you find it, the clues will be connected. Even if it is to ignite wood chips, if the temperature of the glue gun is the highest, then the glue gun will be connected." 180c, it’s still a bit unsightly, so I guess it’s been refitted..."

However, after all, he knew very well in his heart that if such a modified hot melt glue gun really existed, not only as a source of fire, but also in a room where the burning was so intense, even if it survived by chance, I am afraid There was only a mass of scorched black with an indistinguishable shape left.I want to extract evidence from it to identify the murderer.It's like a fool's dream.

So did you choose to create a fire?

"Hehe...ha...hahaha, it's interesting, it's really interesting," William's pupils suddenly flashed a bright red light in the darkness, "Speaking of Xiaoying, do you know why criminals throughout the ages Do you like the act of arson very much—because once you give everything to the flame and let it take away all crimes, all secrets, and all evidence, then the possibility of being punished by law will be completely taken away."

No one knows this better than him...

Thinking of this, he couldn't help laughing again.It sounded low and terrible, as if some glamorous idea amused him, or some heinous attempt had suddenly come to his mind.The laughter came so suddenly and so elusive that Du Ruoying felt a little overwhelmed for a moment.

"What... are you laughing at?"

He stopped laughing and continued calmly: "If—I mean if, if this fire was a perfect crime, due to the lack of evidence, even if the murderer can be found, he cannot be brought to justice , At that time, student Xiaoying, what are you going to do?"

"Perfect crime?!" Hearing this, she suddenly felt startled into a cold sweat, "Hey, hey...don't scare me, if even you think it's a perfect crime, doesn't it mean— —”

However, before she finished speaking, William reached out and covered her mouth tightly: "Shh, someone is here..."

Holding her breath, she first heard her own violent heartbeat, and then quickly caught his breathing that was so peaceful that it was almost imperceptible to her ears. Finally, she finally heard the sound of footsteps, which were slow, cautious, and deliberate. Light footsteps were gradually approaching them.

At the same time, a beam of warm yellow flashlight suddenly broke in——