The second method proposed by Lin Xinyi is very simple.

He asked the more than 100 passengers at the scene to cooperate with his actions, leave the underground platform together, return to the surface, walk out of the tram stop, and finally line up on the sidewalk.

That's all he asks of those passengers.

The passengers present were very incomprehensible about this:

I couldn't find the murderer on this underground platform, so I ran to the ground and stopped on the side of the road, how could I find it again?

Could it be that this murderer belongs to ice cream, and the sun melts when it is sunburned?

"It's inexplicable..."

People don't understand this approach.

But since they all promised Lin Xinyi to cooperate with his investigation as much as possible, and Lin Xinyi may have made a promise to let him go directly if he could not find the murderer within 10 minutes, in the end, the passengers reluctantly agreed.

In this way, under the organization of the tram station staff, the more than 100 passengers lined up in a scattered and chaotic line, leaving the underground platform and returning to the ground.

During the whole process, there was also Miss Maolilan on the side.

She kept an eye on the passengers the whole time, preventing some of them from escaping along the way.

Thereupon...

Without any danger, all of the more than 100 people were transferred to the ground.

Lin Xinyi organized them out of the tram stop and onto the sidewalk outside.

According to Lin Xinyi's request, the more than 100 passengers were chaotically divided into three rows of crooked horizontal lines, keeping a distance between them, and standing parallel to the sidewalk.

Watching the scene...

I don't know, I thought they were here to do radio gymnastics.

"What the hell is this for?"

"The heat is dead... Can this really find the murderer? ”

Standing on the sidewalk, basking in the sun, some passengers were already complaining.

Indeed, inside and outside the tram station are two worlds entirely.

The tram station is air-conditioned and the environment is cool and refreshing.

Outside the tram stop, the sun was scorching, the air was full of scorching heat, and there were annoying flies and mosquitoes buzzing in my ears.

Just after standing for half a minute, many people were already sweating profusely.

"Mr. Lin, how are you going to check?"

Someone asked, puzzled.

"Just stand still." Lin Xinyi replied perfunctorily.

At the same time, like an instructor supervising the military training of the students, he conscientiously patrolled back and forth from beginning to end and from tail to end in front of the three horizontal columns lined up by these passengers.

"I didn't use any technical means, I just watched back and forth..."

"Mr. Lin Xinyi, what are you doing here?"

Sonoko Suzuki muttered bewilderably beside her.

"This..."Kudo Shinichi hesitated, but he didn't see anything:

In his opinion, what Lin Xinyi is doing now is probably similar to that of a detective.

That is, through all clues such as the other person's dress, conversation, eyes, movements, walking posture, and micro-expression changes, plus imagination and logical reasoning, to speculate the person's identity, background, occupation, and experience.

Just as Sherlock Holmes could tell at first glance that Watson was a military doctor who had returned from Afghanistan, detectives were good at this kind of "meet and know people" trick.

But Kudo Shinichi is well aware that the trick of "meeting and meeting people" not only requires strong brain power and keen observation, but also does not work every time.

For it to work, the person being observed has exactly that many clues to observe.

But now there are more than 100 people here.

I want to observe more than 100 passengers in just 10 minutes, and find out the murderer who deliberately hides himself... It's a fantasy.

"Can he really do it?"

"Or... He wasn't looking at the passengers themselves, but something else? ”

Shinichi Kudo vaguely guessed something.

And at this moment, Lin Xinyi finally began to speak:

"You all must be weird, why am I taking everyone outside this tram stop?"

He stopped and stood in front of the passengers, his gaze meeting the suspicious eyes:

"The reason is actually quite simple:"

"Because there's something outside the tram stop that can help me find the killer."

"And there's almost nothing like that in the underground platform."

"What's that?"

Everyone looked at each other and asked questions.

"Don't worry, speaking of this..."

"Let me tell you a little story first."

Unexpectedly, Lin Xinyi did not directly reveal the answer, but began to tell the story:

"In 1247 A.D., that is, in the seventh year of the reign of Emperor Chunyou of the Southern Song Dynasty in China, Song Ci, a forensic scientist who was then a prison officer in Hunan, compiled the forensic science data he had collected throughout his life into a book, and wrote the world's first systematic forensic science monograph, "Collection of Records of Clearing Grievances".

"The publication of the "Collection of Records of Clearing Grievances" means that forensic science in the sense of the system is born."

"......" everyone present couldn't hear it clearly, so:

Why do you still talk about history when investigating the case?

And as soon as I opened my mouth, I started directly from the beginning of forensic science...

Why don't you start with the birth of the main god in the Heavenly Palace?

Lin Xinyi ignored everyone's questioning gaze and just continued to tell his story.

Moreover, he spoke with reverence in his tone.

Just as Kudo Shinichi worships Arthur Conan Doyle, the "father of world mystery novels", as a forensic doctor, Lin Shinichi has always had the highest respect for Song Ci, the world-recognized "father of forensic science".

And now, he is going to use the method taught by his grandfather to solve the case:

In Song Ci's "Collection of Records of Clearing Grievances", such a case is described: "

"One day, a corpse was found on the side of the road in a village, the corpse's clothes and things were still there, and it was covered with sickles and wounded in more than ten places."

"The local prosecutor in charge of investigating the case preliminarily confirmed that the deceased had died of vendetta, so he asked the villagers in the same village to take out the sickle from their homes and put them in the sun to expose them."

"Just like now, the weather was the height of summer and there were a lot of flies flying around the site."

"But it didn't take long for these flies that lingered at the scene to gather inexplicably, and they 'chosen' one from the seventy or eighty sickles on the scene, and gathered on this sickle and flew endlessly."

So the prosecutor went to the owner of the sickle and said to him: "

Lin Xinyi paused slightly, and calmly recited the original text of "Records of Clearing Grievances":

"'There are no flies in the sickles of the people, and now you are murderous, and the smell of blood is still there, and the flies are gathered, how can you hide it?' ”

"Those who look around to the right are in amazement, and those who kill are bowing their heads and pleading guilty."

He quickly finished telling the old story.

And everyone's expressions changed slightly, as if they all faintly thought of something.

"This is the earliest case of using forensic entomology to solve a crime."

"And the reason why flies can help prosecutors find the killer is because their sensing systems are extremely sensitive – they can easily sniff out even small traces of blood that have been cleaned and are invisible to the naked eye."

"And nutritious blood happens to be the favorite food of flies, and as long as they smell blood, these little guys will uncontrollably accumulate in the place where the blood is present."

Lin Xinyi slowly explained the principle of fly hunting, and his eyes gradually became sharp:

"So, do you know why I'm taking everyone out of the tram stop?"

"Because the temperature is low at the tram stop, there are fewer flies."

"And the temperature outside the tram stop is high, and there are many flies."

As he spoke, he paused, his gaze firmly locked on a man in the crowd:

"This case is like the story mentioned in the "Record of Clearing Grievances", the murderer kills someone, and the blood on his hands will be stained when he kills someone."

"And the blood-stained villains on their hands, flies love to be with them."

As soon as the words fell, following Lin Xinyi's eyes, everyone's eyes converged on the man.

The man had a gentle face, his body was clean, there was no blood stains, and there was no so-called murderous aura.

No matter how you look at it, he is just an ordinary person who is kind and angry.

However, at this very moment, around this "ordinary person"...

It's all about smelling flies.

"Come out, Mr. Murderer."

Lin Xinyi looked at the man with a firm gaze:

"You've been defeated by a trick from eight hundred years ago."