"Mr. Lin Xinyi, can you find the cleaned bloodstains?"

Sonoko Suzuki asked impatiently.

Unconsciously, the eldest lady who came to "chase stars" also substituted herself as an investigator and paid full attention to the case.

This sense of engagement has never been felt before.

Because Lin Xinyi relies on knowledge to solve the case, rather than relying on his own IQ that is different from ordinary people like those famous detectives.

IQ is a gift from God, but knowledge is something that ordinary people can master.

So, at this moment, even Suzuki Sonoko, as an ordinary person, will have a sense of participation of "I can understand" and "I understand" -

It's not the estrangement and confusion of "I understand what" and "you understand again" when I saw Kudo Shinichi solve the case in the past.

"Won't the blood be washed away by water?"

Like a studious student, Sonoko Suzuki added.

"It's just clean on the surface."

"The blood can still be flushed with imperceptible trace residues, which we can find through scientific means, such as the luminol reaction."

Lin Xinyi explained:

Luminol, also known as luminous ammonia, emits blue light when oxidized.

The heme in the blood can catalyze the reaction of luminol with hydrogen peroxide, showing blue-green fluorescence.

This test is extremely sensitive and can detect even tiny amounts of blood diluted to one part per million.

Therefore, it is basically impossible to evade the detection of luminol by washing it with water.

If you really want to clean up the traces, you have to destroy the human DNA with a strong oxidizing agent such as hydrogen peroxide, then rinse the scene with animal blood, cover it, and finally rinse it again with bleach.

And the prisoner fled the scene in a hurry, and immediately after being trapped on the platform, he was definitely not in a position to clean up the traces so thoroughly.

"Lumino..."

Kudo Shinichi on the side reacted with hindsight:

"Yes... There is such a thing. ”

"But I don't think I've ever seen it used by the Metropolitan Police Department..."

He suddenly remembered that he had learned this knowledge point in Hawaii.

It's just that so many cases have been solved... Whether it's him, other detectives, or the police, basically no one has used this kind of technical means.

Before you know it, this thing is almost forgotten by everyone.

"Huh? Haven't seen the Metropolitan Police Department use it? ”

Lin Xinyi's scalp tingled when he heard this:

Luminol has been used for criminal investigation blood tests since the 30s, so the Metropolitan Police Department will not be equipped until now, right?

No... At the level shown by the Metropolitan Police Department in this world, it may also be equipped and useless.

Otherwise, if they can use all the forensic science and technology that the police have, there will be no detectives.

"I hope the Metropolitan Police Department can be more reliable this time..."

"At least the most basic survey tools must be available."

Lin Xinyi sighed helplessly in his heart.

Then, ready to take a luminol reaction blood test, he came out of the scene of the crime with Kudo and Sonoko and came to the platform outside.

And at this time, Lin Xinyi discovered...

The real difficulty in the investigation of the case is not in the technical equipment, but in the people, the more than 100 people who were forcibly left behind to cooperate with the investigation.

Lin Xinyi and the three of them just came out of the bathroom, and the waiting passengers who were guarded on the platform and were not allowed to leave immediately came over:

"It's out, it's out!"

"Have you found out who the murderer is?"

More than 100 pairs of eyes looked at each other, and their eyes were basically full of impatience.

"Uh... Not yet. ”

"But we have found a way to locate the murderer, and when the Metropolitan Police Department technicians come over, we will be able to find out who the murderer is."

It was Shinichi Kudo who stood up to speak, he was more well-known and had more prestige in front of the masses.

But this time, even the prestige of the great detective didn't work:

"What? Wait for someone from the Metropolitan Police Department to come..."

"Could it be that Shinichi Kudo didn't find the murderer at all?"

Everyone was disappointed, and the reputation of Detective Kudo Shinichi was victimized again.

In the imagination of these passengers, there is "Heisei Holmes", and it should not take a few minutes to find the murderer.

Therefore, when they think that the case will be solved soon, they will wait patiently until now.

But now, the savior of the Yuben police said that he had not found the murderer, and he had to wait for the Yuben police to come before he could start the investigation.

Joke... The savior has not been found, and the one who is saved has a way?

"Can those guys who eat white rice really find the murderer?"

"How much time will it take to wait for those useless police officers to come and slowly investigate the murderer?"

"If you can't find it again... Do you want to keep more than 100 of us detained? ”

The passengers waiting for the train shouted in disarray.

It's not about themselves, and the pace of life of the citizens of the metropolis is usually tense, and they don't want to lose too much time because of a dead person they don't know.

Whether the murderer can be caught or not has nothing to do with them, but if he delays his work in the afternoon because of this incident and is punished by the company, it is a really unacceptable big event.

"Hey, hey..."

The passengers' tones became hot again:

"Let's talk about it, when will this be over?"

Kudo Shinichi was speechless, and could only turn his gaze to Lin Shinichi for help.

Lin Xinyi stood up and tried to say in a calm tone:

"One afternoon, one afternoon should be solved."

Luminol reagent is actually a mixture of luminol and hydrogen peroxide, which must be proportionally blended on-site before use.

The luminol reaction glow is extremely weak, and the light generally only exists for a few seconds, which is difficult to observe with the naked eye, and it is necessary to set up a curtain to block the light source and arrange a dark room before it can be used.

After doing these preparations and investigating more than 100 people one by one, it was still a conservative estimate in one afternoon.

But as soon as these words were spoken, the passengers became even more emotionally unstable:

"One afternoon, so long?"

"Hey, hey... I don't want to wait! I'm not a murderer anyway, let me go directly! ”

Someone is already starting to stir up impatiently.

"Yes! There was a detective here before, and I thought it would be solved in a few minutes. ”

"Now we have to wait for the Metropolitan Police Department to come, and the time has become an afternoon - can it really be solved in one afternoon? We won't continue to be detained then! ”

More and more people echoed it, and the atmosphere at the scene became tense.

Looking at their posture, there is a great intention to force them to leave directly.

"Mr. Kudo, Mr. Hayashi."

At this time, the tram station staff who was responsible for maintaining order came over with an ugly face:

"Forget it... I can't stop so many people. ”

"If they get out of control and have a conflict, we can't afford it."

"This...."Kudo and Lin Shinichi were both helpless.

Indeed, it is not a small matter that more than 100 people are making trouble.

No unit is willing to take on this responsibility for stirring up group conflicts.

Not to mention the staff at the tram station, even if the Metropolitan Police Department comes forward, they have to be obediently allowed to pass in this situation.

And although Xiaolan's force is a strong deterrent, everyone knows that this little girl can't really hurt people.

"Why don't you just let it go?"

"Something is going to happen if this continues."

The staff member asked again, and he was obviously desperate to get rid of the hot potato as soon as possible.

In this way, the passengers wanted to return to freedom, the staff wanted to avoid risks, and only four people were left who were still thinking about the deceased, including Lin Shinichi, Kudo, Xiaolan, and Yuanzi.

The situation is about to spiral out of control.

Someone had already begun to force their way out, and the tram station staff who were responsible for maintaining order did not dare to stop them.

"Wait!"

At the critical moment, Lin Xinyi stood up.

"Don't rush to leave, everyone."

"Give me 10 minutes, and within 10 minutes I will definitely find the murderer!"

"Huh?"

The excited passengers suddenly fell silent:

"10 minutes to solve? You're not lying, are you? ”

"Trust me." Lin Xinyi said very solemnly: "As long as you honestly cooperate with my investigation, 10 minutes is completely enough." ”

"And what if you haven't found it by then?" Another thorn in the crowd asked.

"Alas..."Lin Xinyi sighed lightly, and reluctantly promised: "Then we will release people!" ”

"This..."

The more than 100 passengers were silent for a while, but finally agreed to this condition:

"Okay, then we'll wait here for another 10 minutes."

The platform finally fell silent.

And Suzuki Sonoko couldn't wait to come over and asked with some concern:

"Mr. Lin Xinyi, 10 minutes is enough for the Metropolitan Police Department to rush to the scene, how can there be time to do that Rumi... Luminol test? ”

"Otherwise, it really won't..."

"I can help you stop them."

Suzuki Sonoko thought that Lin Shinichi was forced to delay the army.

Therefore, in order to find out the murderer and share the worries of the idol, Miss Suzuki is ready to stop being low-key and take the initiative to help keep these guys who are unwilling to cooperate-

Back then, Jackma could make tens of millions of netizens call him dad willingly, and now Miss Suzuki, who also has the ability to make money, naturally has a way to make the more than 100 people present today obedient.

It's nothing more than throwing more money, and the last thing she lacks is money.

But Lin Xinyi rejected Suzuki Sonoko's kindness: "It's okay, I can solve it." ”

"Mr. Lin, I can really help."

"Actually, I'm Choi Suzuki..."

Yuanzi instinctively thought that Lin Xinyi didn't know her identity at all, and felt that she couldn't help, so he politely rejected her.

And just when she was about to reveal her identity and blind Lin Xinyi's eyes, Lin Xinyi said to her very seriously:

"Don't worry, I really have another way to find blood."

"Although this method is not as accurate as Luminol, it is the most appropriate in this situation."

"Oh?" The worry in Suzuki's eyes turned into curiosity and adoration: "Is there another way?" How? ”

"Haha."

Lin Xinyi looked up at the ceiling and joked meaningfully:

"This underground platform is too cold and easy to hide dirt and dirt."

"Then let's go to the surface and let everyone see the sun."