Qin Zhibo's eyes fell on the ventilation window on the door, and he immediately thought of a way to create a secret room.

Just use a long enough cylinder to slide the key into the drawer along the middle of the cylinder, and then use it to slide the notebook onto the key and slide the drawer back.

As for the specific objects used to achieve this technique, Qin Zhibo looked at the vase placed on the low cabinet.

【Survey√】

[There are fragments of posters on the fake flowers in the vase. They were probably not placed here intentionally]

The position of the vase is more than one meter above the ground. If the poster was sprinkled directly on the floor at the door, it would not be sprinkled here.

The existence of this investigation point shows that the murderer indeed used the ventilation window to throw the torn posters in from the outside.

Countless poster fragments were thrown from high places, floating in uncertain directions, and one of them happened to fall on the vase on the low table next to it.

The purpose of tearing up the posters, apart from creating mystery, can only be to dispose of the tools.

Posters are one of the tools for committing crimes.

Qin Zhibo stared carefully at the countless poster fragments on the floor, squinting his eyes slightly.

Suddenly, he seemed to see something and turned around to turn off the light in the room.

The room suddenly became dark, only the light source in the corridor could illuminate it.

This step of operation shocked everyone standing at the door, with doubts appearing on their faces.

Although among them, except for the man with glasses, they got a taste of how detectives solve crimes on the spot by inviting the Maori family to do a show last time.

But according to common sense, the detective should want the light to be brighter, so that it is easier to find clues at the murder scene.

But the famous detective in front of him did exactly the opposite...

However, they didn't know that Qin Zhibo had already taken advantage of this low-visibility environment to see new investigation points among the poster fragments.

【Survey√】

[Some poster fragments have damage on their edges. How could this be caused? 】

The description of the investigation is a question, which means that as long as we solve this problem, we will be close to solving the method used by the murderer.

Qin Zhibo followed the position of the light spot, stepped on the edge, and picked up the poster fragments from the chaos.

The fragment of this poster is located at the very edge of the whole poster, and the edges are covered with layers of squeeze marks.

This kind of mark is somewhat similar to the wrinkles on Jiangxiang pancake.

However, the paper used to print posters is relatively hard. If the poster is placed on a flat surface, it will be difficult for humans to make such marks.

unless……

Qin Zhibo used the light from the investigation point to pick out many poster fragments with the same traces among the poster fragments.

These fragments all have one characteristic.

It is located at the edge of the poster, and the edge is completely scratched.

This is obviously a special mark made by the murderer after using these posters.

In an instant, the murderer's method of using these posters became clear to Qin Zhibo.

Next, all that remains is to completely crack the secret room between the meditation rooms on the first floor.

"Let's go back downstairs."

Qin Zhibo turned around and walked out of the room, locking the door with his backhand to prevent others from entering the scene.

On the way back to the first floor, the short-haired girl finally couldn't help her doubts and asked.

"Um... Mr. Detective, where is the student Kuroba who came with you?"

After her reminder, others also remembered that they had not seen Kuroba Kaito for a long time.

Qin Zhibo was stunned for a moment and could only explain forcefully, "He is still having diarrhea and cannot come out of the room."

When the short-haired girl heard this, she frowned, put her hands in front of her heart and said worriedly: "But if you keep doing this, will your intestines and stomach be damaged? Do you need to send her to the hospital..."

"It doesn't matter, it doesn't matter, this guy has a strong body."

Qin Zhibo waved his hand and was temporarily fooled.

However, Kuroba Kaito did disappear for a while, and I don’t know where this naughty boy went.

Solve the case quickly and go find him.

Alas~

It really makes me worry about my father~

…

When everyone returned to the meditation room on the first floor, they saw Koizumi Hongzi standing in front of the mirror in the corner.

This mirror was previously used by Koizumi Hongzi to perform psychic skills, but the result was a complete failure.

At this moment, she was standing in front of the mirror, facing the mirror, wearing a red robe, motionless.

Alas~ the little girl started to be narcissistic again...

Qin Zhibo was a little speechless. He brought this pair of boys and girls, one was naughty and a bad girl, and the other was narcissistic and willful.

Not as obedient as Conan!

Qin Zhibo ignored Koizumi Hongzi and started investigating on his own.

First of all, the most eye-catching investigation point is the investigation point on the neck of the blonde girl’s body.

【Survey√】

[An unusual strangulation mark]

The fewer the words, the bigger the matter.

Qin Zhibo leaned his head over and after a quick look, he discovered the problem.

This is a trace without the Yoshikawa Line.

The so-called "Yoshikawa Line" means that when someone strangles the neck, the victim will subconsciously use his hands to open the rope to give his throat room to breathe.

The traces produced by this struggle are the Yoshikawa Line.

The blonde girl's neck was a complete mark of strangulation, without any trace of struggle, and her expression was as calm as if she was asleep.

"Um……"

Qin Zhibo groaned, silently writing this down in his mind.

Next are trivial investigation points elsewhere in the room.

Hidden are the motor behind the bookcase, the motor remote control on the low cabinet, and the fallen A-shaped ladder in front of the skylight switch...

These are obviously props used to shape the secret room.

Instead, the murderer used Hirasaka's trick of pretending to be a ghost during the seance to make it reasonable for these props to appear at the murder scene.

This shows that the murderer should have known about the various techniques Hirasaka planned to use at the seance before the seance.

Otherwise, just relying on more than an hour after the seance ended, I would not have been able to come up with such a complicated method.

Coupled with the discovery of the purpose of the poster upstairs, Qin Zhibo already had a rough idea of ​​the method of creating a secret room.

Next is the identity of the murderer and the evidence.

The murderer was obviously someone who might have known in advance the techniques Hirasaka used in the séance.

Among them, the doctor man is currently the most suspected.

He made it clear that this plan was planned by him and Hirasaka, and the purpose was to find the person who threatened them and killed the editor.

He had every chance to plan the crime in advance.

Secondly, girls with short hair.

Judging from the information provided by Takagi Wataru, the short-haired girl was also one of the party participants who caused Yahara Huang's death.

Therefore, Hirasaka may have discussed these matters with her.

However, considering the short-haired girl's figure and physical strength, she may not be able to complete this highly difficult crime method.

Is there anyone else?

Qin Zhibo fell into deep thought again.

After a while, he still felt that the three recent murders should be analyzed together.

The first case was the death of a male editor half a month ago.

In this case, the murderer left the word "kira" in blood next to the body.

So the murder motive in this case was to avenge the death of Yahara Huang.

However, in the two cases that happened today, the blonde girl was strangled to death, and Hirasaka was poisoned to death. There were no bloody words or any other traces left next to them.

Generally, serial killers will not easily break the pattern of killing they established at the beginning.
To be continued...