"There are pliers in the storeroom." With a pale face, Omiya Yanko led the police downstairs to find the pliers and take them back upstairs.

"Crunch!!"

The pliers clenched the chain and made a creaking sound, after all, this pliers were not hydraulic pliers specially designed for unlocking, and it was somewhat laborious to use.

"Boom!"

"The chains are open!"

The chubby Chiba and Shin officers blushed, and with a clattering sound, they finally opened the chains.

And the moment the lock was opened, several policemen immediately rushed in, staring around smartly, beware of the murderer who might be hiding in the room.

"Didn't find it in the living room."

"I didn't find it in the bedroom either."

"Not in the cupboard."

"Not under the bed."

The Metropolitan Police Department officers searched for any place where they could accommodate people, the cabinet under the stove, the inside of the drum washing machine, and anything else suspicious.

In view of the strangeness of the prisoners in the world of Kexue, even the ceiling was checked.

But no matter where it was, there was no one.

No figures were found.

The murderer was not in this room, but the chains, which could only be locked from the inside, were locked.

"Murder in a closed room?!"

Officer Wataru Takagi immediately popped up the word in his head.

In the Kexue world, most prisoners like to kill people in secret rooms, and they go to great lengths to arrange impossible scenes of murder in secret rooms, and then they are seen through by detectives in one fell swoop, just like an experience package sent to the detective.

Officer Twilight and the others also remembered to kill people in the secret room at this time.

The murderer marched away after assassinating Takemura, and at the same time created a scene of murder in the secret room, locking the chain locks that could not be locked from the outside!

"You continue to search, and the personnel of the forensic department collect fingerprints and other information from the scene."

Officer Twilight waved his hand and laid out the work on the scene.

Kudo Shinichi glanced around the room a few times, but didn't see any doorways, and then observed the chains that had been cut short.

"New Gentleman ......"

Moriran bent down and looked at Shinichi Kudo, who was crouching in front of the door.

“……”

Shinichi Kudo was carefully examining the chain design behind the door.

The principle of this chain lock is ————that one end of the chain is tightly attached to the door door, and the other end has a metal bolt with a counterweight that can be attached to the door frame.

It's a simple design, but it's effective at defending against people outside, and even if someone tries to hit the door, they will be blocked by a padlock.

And even if you want to reach out from the outside and pull out the door bolt, it is impossible to do it with a human arm and wrist, not to mention that there is another mechanism on the bolt.

"Could it be done with a rope or a thread...... Kudo Shinichi wondered how he could lock the key lock from the outside of the door.

In the detective world, a universal rope mechanism is indeed possible, but Kudo Shinichi has not yet figured out how to do it.

"Then Xinyijun, could it be that the prisoner made a mechanism on the chain?" Maorilan also has some reasoning ability, after all, one of his parents is a former police officer, and the other is the undefeated queen of the legal profession, and when it comes to reasoning ability, Maorilan is stronger than many policemen.

"What do you mean?"

"For example, the rings and rings of the chain are removable, just like a keychain."

"It's impossible." Kudo Shinichi shook his head and denied, "The chain is welded, and it is impossible to disassemble and install it. ”

"That's right."

"But why did the prisoner create a scene of a murder in a closed room," Mao Lilan noticed a key point: "If it is a murder in a closed room, there must be a reason to do so." ”

"Well, generally speaking, a murder in a closed room is to disguise his killing as an accident or suicide." Kudo Shinichi pondered as he answered Xiaolan's question, "Or maybe by creating a secret room, we can prevent us from getting some key clues...... There must be a murderer's reason for creating a secret room. ”

"But there are other possibilities."

A male voice rang out above Shinichi Kudo's head.

Mito Moon also squatted down at the door at this time, staring at the chain lock side by side with Kudo Shinichi: "For example, the murderer deliberately created a secret room after killing people out of a show-off mentality, so that the police who came to investigate in the future were deflated. ”

This kind of prisoner can be put another way, a pleasure prisoner.

Committing a crime will make them feel happy, and they will sin out of pleasure, not because of a specific vendetta, a love killing.

Especially in the case of a crime of passion, such as one day the prisoner is in a bad mood, or the mood is too good, driving in the wilderness, killing a lone traveler and then walking away, this kind of crime of passion is the last case that the police want to encounter.

Kudo Shimoi glanced at the classmate next to him who was also excellent in reasoning: "It's possible that there is this...... Mito-san, do you have a clue? ”

"......" Mito Moon didn't speak, as if she was immersed in her own thoughts.

"I have an idea...... "Nabe Shion, who has nothing to do with others, also entered the scene at some point, and as the editor of the mystery novel, she raised her hand weakly, "Could it be that the prisoner just locked the key from the inside and left the room in some way, like leaving through the balcony." ”

"It's also possible." Wataru Takagi also walked over at some point, and he nodded in agreement with Nabe Shion's thoughts.

Takagi walked to the balcony and propped himself up and looked up and down, "The prisoner can crawl slowly down the outer wall, or go to the top of the building, after all, the sixth floor is the top floor, and it is also convenient to reach the roof of the building...... Yes!! Could the murderer still be hiding on the roof of the building? ”

Takagi's words opened up the minds of the other policemen, and Officer Twilight waved his hand: "Quick! Take a look at the rooftop. ”

Hiding the body of the deceased in the roof tank after the murder, or hiding on the roof of the building, is a possibility!

The prisoner may have waited for the police to leave, and then escaped from the roof of the building where he was hiding, so that he could create an impossible secret room killing.

Except for the two policemen guarding the door, everyone headed towards the roof for a while.

But the roof was equally empty, and there was no one there.

The water tank and power distribution room where you can hide have all been inspected and are empty.

"Damn! There was no one on the roof! ”

"Where the hell did the prisoner hide, or did he somehow get out?"

Standing on the roof of the building in late autumn, with a cool breeze, Nabe Aster, who was only wearing overalls and no coats, couldn't help but tremble.

"So there's only one way to climb downstairs from the room on the sixth floor? The balcony is not blocked, and since Miss Takemura can fall from the balcony, it can naturally be used by another person to climb out. ”

"Then I'll check the wall for any signs of being climbed."

Officer Twilight stood on the roof of the building blowing the wind, and had some headaches about why he always encountered such abnormal homicides: "Also, call Miss Sekiguchi, if the prisoner really climbed down from the balcony, Miss Sekiguchi should be aware of it." ”

The case reached an impasse for a while.

Shinichi Kudo carefully observed the rooftop, paying attention to every suspicious corner.

He then looked at the distance between this apartment and other buildings and houses, the difference between height and height.