There is a murderer who kills people in this "police den".

And it's the second lady of the Suzuki chaebol who wants to be killed!

This is undoubtedly big news.

"Check, we must investigate the truth as soon as possible!"

"No one is allowed to leave the scene until the murderer is caught!"

The head of the criminal department, Toshiro Odakiri, gave the order to the police with a serious expression.

The colleagues of the Metropolitan Police Department who were present also looked serious:

They all realized the seriousness of the matter:

If the results of this matter can be found out today, the headlines tomorrow will be:

A frenzied attack on a police gathering caused the first stupid thief in history to throw himself into the net

If you can't find out the results of this matter today, and you can't find out where you can go, all the guests present will be released, and tomorrow's news headlines will be:

When she died, the police were shooting arty next door

The Metropolitan Police Department, which spends 600 billion yen a year, can't catch thieves at the doorstep

A feast for the Metropolitan Police Department, a carnival for the offenders

Thinking of this, the officers couldn't help but blush.

They were filled with righteous indignation, their blood was surging, and their fighting spirit was surging.

Everyone is at their best.

also used their killer trick as the elite of the Metropolitan Police Department:

"Lin Stewardship!"

Everyone looked at each other:

"What do you think of this case?"

The killer weapon is naturally to summon Lin Xinyi.

The Metropolitan Police Department's face was picked up by him alone.

If it weren't for Lin Xinyi, the prisoner would have wanted to slap the Metropolitan Police Department in the face like today, and the Metropolitan Police Department would not have the face to beat others.

So, these days, subtly, as long as they encounter difficult and miscellaneous cases, everyone will think of this invincible forest management officer for the first time.

"Uh..." Lin Xinyi's expression was a little embarrassed.

The general course of the case, he has just heard a report from Miwako Sato.

Generally speaking, this kind of case where the murderer does not run away after killing someone and stays at the scene to pretend to be innocent is very easy to solve.

No one needs to think of a way to let Caesar get out of the horse, one by one.

But this murderer is not ordinary.

"The overalls he was wearing when he committed the crime were almost burned."

"The pistol left at the scene can't help but be wiped clean, and it has been roasted by fire, so there will be no residual smell of the murderer."

"And the entire floor of this building is still covered in stagnant water, and the footprints and smell of the killer are gone."

"And Miss Mori and Miss Sato haven't seen the murderer's true face, so I don't know what he really looks like..."

"To be honest, it's hard to find him from so many people."

Lin Xinyi reluctantly stated the difficulties he encountered.

There was only one old man in a suit in the crowd, who secretly breathed a sigh of relief.

Others, especially their colleagues in the Metropolitan Police Department, did not look so good:

"What then, Steward Lin?"

“......”

Lin Xinyi sighed helplessly:

He complained about this hardship in order to let everyone work together to find some way to help put forward opinions.

It turned out to be a piece of Teletubbies' innocent big eyes.

Among the elites of the Metropolitan Police Department present, it was obvious that no one could help him.

He could only try his luck:

"I'll go to the scene first..."

"Let the identification class bring all the personnel and equipment first, the more complete the better."

"By the way, don't forget to bring Caesar."

At such a critical juncture, it is the only reliable colleague.

Lin Xinyi made a simple arrangement, and then took Mao Lilan and Miwako Sato, who had personally experienced the case, back to the scene to do a preliminary investigation.

The first thing I went to was the women's bathroom.

"Damn... Bathrooms are also equipped with fire sprinklers? ”

Lin Xinyi was defeated by the high standard of safety configuration of the Rice Flower Hotel:

There was more water on the floor of the bathroom than in the hallway outside, and the footprints and smells left on the floor were completely destroyed.

As for fingerprints, palm prints, hair, etc...

The murderer committed the crime wearing gloves and hair covers, and these things were not left at the scene at all.

And the gloves he was wearing when he committed the crime, along with his clothes, were burned by him.

"This murderer has a very good set!"

"And this is the time to assassinate Miss Suzuki..."

"I'm afraid it's a professional killer of some underground organization."

Lin Xinyi secretly sighed for the murderer's professionalism.

In his mind, he suddenly made up a grievance of a wealthy family that could shoot 80 episodes of TV series:

Who would hire a hitman to assassinate Sonoko Suzuki?

Sonoko Suzuki is dead, who is the best for it?

According to this line of thought, Suzuki Sonoko's sister is going to be brain-made up as an evil lady who kills her sister and fights for the inheritance.

"Probably not..."

Thinking of Miss Ayako Suzuki, who spoke weakly, Lin Shinichi temporarily dispelled this unwarranted speculation.

In the end, he gave up the reasoning and imagination that he was not good at, and honestly started from the perspective of on-site investigation:

"Let's go to the utility room again."

"If you can't find any traces there, I'm afraid things will be in trouble."

Lin Xinyi sighed lightly, then turned around and walked towards the utility room.

And he just walked to the door of the utility room, just looked inside at the narrow space structure of the utility room, and his expression suddenly changed:

"It's... Close the door! ”

"Don't let the air get out!"

"Huh?" Mao Lilan was slightly stunned.

She subconsciously obeyed Lin Xinyi's order, closed the door of the utility room, and then asked with some puzzlement:

"Mr. Lin, have you found any clues?"

"That's right... The air in this room is the clue! Lin Xinyi replied succinctly: "There is a residue of the murderer's smell in it, which can be used by Caesar to track down." ”

"Police dog tracking?"

Hearing Lin Xinyi's proposal, Mao Lilan was a little puzzled:

"But there's also a fire sprinkler in the utility room."

"The floor in the utility room is also soaked in stagnant water, and there is no way to extract the residual smell."

"No, it's okay if the ground doesn't smell."

Lin Xinyi shook his head:

Māorilan, as well as other trained forensic officers, are accustomed to extracting residual odours from scene footprints.

This is because the smell of the human feet is the heaviest.

In addition, the soles of the feet are in direct contact with the ground, so the smell can better adhere to the ground and be stored for a longer time.

If it is on a dirt floor, the smell will last up to a day under standard windless conditions.

Even on such an indoor hard concrete floor, the odor can remain at the initial concentration of 10 after 3 hours under standard windless conditions.

But all this, washed away by the water, is gone.

That's why Mao Lilan felt that in this case, police dog identification was no longer feasible.

"But you can."

"Come to think of it, I taught you that you don't have to go through a solid medium like the ground to extract the source of smell."

"Under special conditions, we can extract the source of smell directly from the air!"

Lin Xin explained one by one, and Mao Lilan suddenly realized:

"Oh... That's right. ”

"In a confined space, we can extract scents directly from the air!"

Following Lin Xinyi's prompt, she carefully recalled the spatial structure of the utility room.

There was very little space in that utility room.

And there are no windows, no vents.

Even when the door is open, the air and the outside world circulate slowly.

There is a fire sprinkler inside, and it has been sprayed with water.

But the lotus-shaped mist from the fire sprinklers couldn't cover all the air in this utility room.

There is also a large part of the air that has not been washed by the water mist, and if there are any residual body odor molecules in it, they may still remain in the utility room.

"It's not very promising, but it's worth a try."

"As long as there is residual body odor in the collected air... Then we will soon find out who the murderer is. ”

All traces that could be investigated were erased by the murderer.

Lin Xinyi put all his hopes on Caesar.

He blocked the door tightly, even taped all the gaps that might leak, and waited for the forensics class to bring Caesar and the equipment to the scene.

And because this slap in the face directly hit the Minister of Crime, everyone's speed of action has obviously improved.

It didn't take long for the hotel to wait for the equipment and dogs to be delivered to the scene.

Caesar was on a rare official duty this time, wearing a black vest uniform of Olice, sitting there vigorously, looking very imposing.

Lin Xinyi touched its head, and then instructed his subordinates:

"Bring the on-site odor extractor."

Odor extraction with an on-site odor extractor is another odor extraction method that is different from the gauze infection method.

This is also generally used to extract odors from items such as footprint soil, clothing, gloves, etc.

Generally, the item to be extracted is put into a closed gas collection hood, and then the suction device is used to continuously pump out.

The gas is pumped from the hood to the odor enrichment chamber through an adsorption device filled with an absorbent cloth or molecular plug.

It is probably a "range hood" with a "filter element".

And now, Lin Xinyi wants to use it to directly extract the air in the utility room.

When you use it, it looks a bit like a vacuum cleaner.

It's just that it's not the dust that sucks in, it's the air in the confined utility room.

After some hard work, Lin Xinyi had already pumped the air in the utility room vigorously.

If there were body odor molecules left behind by the prisoners, they should have all been enriched on the inhalation cloth in the odor enrichment bin at this moment.

Lin Xinyi carefully removed the suction cloth with tweezers and kept it in the scent storage bag.

"Caesar, it's your turn."

He grabbed the leash and led Caesar back to the banquet hall.

At this moment, all the guests and waiters in the venue were controlled by the police, waiting for Lin Xinyi to find a way to screen them.

"Steward Lin, have you found the murderer?"

The crowd looked nervously or curiously.

"Just try it."

Lin Xinyi did not give an answer.

He just slowly crouched down and opened the seal of the scent storage bag, allowing Caesar to sniff the scent carefully.

Caesar soon stuck out his tongue, wagged his tail, his breathing became rapid, and his gaze became sharp.

This is "live".

It recognizes human scents.

There was a sudden silence.

This plush black-backed dog has become the protagonist of all attention at the moment.

I saw that it first looked around excitedly, and then circled around Lin Xinyi:

"No, it's not me..."

"Is there any smell of anyone else?"

It is almost inevitable that the smell collected at the scene will be disturbed by the body odor of others, mainly investigators.

And the trained police dogs have the ability to eliminate interference one by one.

With the assistance of Lin Shinichi to correct it, Caesar quickly sniffed out Moriran and Miwako Sato, who had been to the utility room.

And then...

"Woohoo!"

Caesar barked at someone in the crowd.

Kenzo Kashiyama's face changed drastically.

"This old gentleman..."

The righteous police officer Lin Da stabbed the criminal in his true form:

"The murderer of Miss Garden, that's you, right?!"

Kenzo Kashiyama, the trump card of the Metropolitan Police Department.

：。 ：m.x