Lin Xinyi was shocked by the news:

Although he knew that the prisoner's dilemma theory was indeed useful, and in real-life investigations, this interrogation method of separate interrogations, disintegrating trust, and stimulating competition was basically always successful.

However, according to Lin Xinyi’s experience gained from working in the police force for several years:

The theory is easy to use, but it does not mean that the practical process is easy.

Because criminals who dare to join forces to commit major human life crimes generally have a strong sense of resistance, their interrogations often take hours or even days.

Just like using a network disk account without a membership to download hundreds of gigabytes of resources, interrogators must use extraordinary patience, meticulous and time-consuming work to break down the suspect's psychological defenses bit by bit.

And now, the two suspects, Kuroiwa and Kawashima, confessed in less than 20 minutes.

He didn't even resist...

Even if you are determined to surrender, if you hold on for a little longer, you can force the other party to come up with better agreement terms, right?

Therefore, Lin Xinyi never expected that Kuroiwa and Kawashima would admit their guilt so quickly.

"This is too cooperative!"

He sighed deeply in his heart.

But this is because Lin Xinyi made an empiricist error, and there is no specific analysis of specific issues:

The basis for resisting the prisoner's dilemma is the mutual trust between multiple suspects in the criminal gang.

As for Kuroiwa and Kawashima, they had already turned against each other because of the election for village chief. Over the years, they had developed deep grudges and had no trust in each other.

In addition, a more important reason is:

While distrusting each other, Kuroiwa and Kawashima also have great distrust of Nishimoto Ken:

Takeshi Nishimoto quit the business 2 years ago due to psychological problems. In the past 2 years, he has been staying at home every day, turning his house into an abandoned house.

Every time he met with them, Ken Nishimoto wouldn't touch any of the pots, insisting on shouting crazy things like "Keiji Aso is still alive" and "Keiji Aso has come for revenge".

At that time, the police hadn't even arrived yet, so Ken Nishimoto scared himself crazy.

Now that the incident has been revealed and the police are here, can this coward still keep his mouth shut?

Anyway, Ken Nishimoto will definitely not be able to insist on confessing and confessing to them——

In this case, they might as well admit it early and seize the opportunity to plead guilty first and surrender and have their sentences reduced.

Kuroiwa Tatsuji and Kawashima Hideo both thought so.

What they didn't expect was that the team's shortcoming that they were most worried about turned out to be the one that persisted until the end:

"No, I didn't kill anyone."

"Don't believe Kuroiwa, Kawashima and the others' lies... I was only involved in the business, not the murder!"

"At that time, it was Heiyan and the others who threatened me to help give false evidence, that's all...other things have nothing to do with me!"

Takeru Nishimoto's face was covered with big beads of sweat, but his mouth was even more stubborn than before.

"How dare you talk so loudly when you are about to die?!"

"Kuroiwa, Kawashima has been guarded by someone since he was arrested. There is no chance of colluding with him in advance."

"If they are interrogated separately, they all invariably accuse you of participating in the murder, and the details of what happened are consistent with each other."

"Then there is no doubt that you participated in the murder!"

Lin Xin choked Nishimoto Ken back with just a few words.

But Ken Nishimoto was still there like a repeater: "No...I didn't kill anyone..."

Lin Xin showed disdain, but quietly frowned:

Although Kuroiwa and Kawashima's confession testimony was enough to convict Ken Nishimoto along with him.

However, this kind of case has no physical evidence or clues and relies entirely on interrogation confessions. If there are obvious conflicts in the testimony of three people, it will not only be difficult to successfully conclude the case, but also cause fierce controversy in the subsequent conviction process.

"It's really troublesome..."

Lin Xinyi's brows furrowed deeper and deeper.

And he also discovered that he seemed to have misjudged Nishimoto Ken's mental condition.

Although this guy has done too many bad things and feels guilty, he is afraid of ghosts rather than humans, and is afraid of divine punishment rather than human punishment.

He can be frightened into isolation by the imaginary "Keji Aso's evil spirit", but in front of the police he can act cowardly yet strong-willed, calm in panic, and his ability to withstand pressure is beyond imagination.

"It doesn't matter, Nishimoto Ken can't escape the crime anyway..."

"I've done everything I can. It's better to leave the headache of sorting out the testimonies and convicting and sentencing to the professional interrogators and judges."

Lin Xinyi thought for a while and couldn't think of any way to make Nishimoto Ken confess his crime honestly.

He planned to retire just like that and leave the problems he couldn't solve to his colleagues in the Metropolitan Police Department.

At this moment, the door of the interrogation room had just opened...

Asai Narumi's delicate face with a complicated expression suddenly appeared in front of Lin Xinyi:

"Mr. Lin."

"The police officers you sent out to investigate found evidence that my father left behind in the village."

"Did you really find evidence?" Lin Xinyi was a little surprised.

He sent police officers to Yueying Island to visit and investigate, just to try his luck and not have much confidence.

Unexpectedly, after 12 years, there is actually evidence that has survived:

"Yes, the evidence was obtained from the only serving veteran policeman at Yueying Island Police Station during the investigation."

"The police from the Tokyo Metropolitan Police Department did not investigate the fire scene, but the police officer from the island police station found a safe that was not damaged by the fire from the ruins of my house."

"There is nothing else in the safe except a sheet of music."

"And that piece of music score has been kept in the office by the policeman grandpa."

Saying that, Asai Narumi took out a thin sheet of music that had been kept in a plastic evidence bag from his arms.

He held the sheet of music gently and his eyes became deep:

"This is not an ordinary musical score, but a suicide note that my father left for me in a coded code before he died."

"He taught me this secret code that corresponds to the Roman letters and the piano keyboard before, so I can understand it:"

"In the suicide note left before his death, my father had clearly written down the reasons and process of the four demons locking them in the house and setting them on fire."

"This is the evidence he left for us at the last moment of his life..."

"Mr. Lin Xinyi, with this suicide note, those evildoers should be punished, right?"

Narumi Asai gently handed over the sheet music and looked at Lin Xinyi with eyes full of expectation and gratitude.

Lin Xinyi took the mottled and yellowed music score and looked at it carefully...

Seeing all the traces left on the music score, his expression gradually became solemn:

"Well, I definitely will!"

"Now both Kuroiwa and Kawashima have confessed."

"With their testimony and this suicide note, there is no chance of overturning this case!"

The testimony obtained during the interrogation alone was enough to convict the three of them.

Now that this crucial piece of evidence is found, the physical evidence and testimony are combined, and the case becomes completely irreversible.

"Ken Nishimoto! What else do you have to say?"

"With all the testimonies and evidence, do you think you can continue to carry on?"

Lin Xinyi looked sharply at Takeshi Nishimoto, the murderer who still refuses to let go.

"I..." Ken Nishimoto's face looked extremely ugly.

But he now knows that he has been one step behind Kuroiwa and Kawashima in the competition, and has lost the opportunity to surrender and have his sentence commuted.

Therefore, this guy broke the rules and became unwilling to let go:

"Say, what did you say?"

“What can a sheet of music say?”

"How do you prove that this sheet of music was left by Keiji Aso?"

"It took 12 years to come up with such a piece of music... You said it was a suicide note, right?"

Ken Nishimoto jumped over the wall and even questioned the authenticity of the evidence.

And he doubted it with confidence:

The music score had been kept secretly by the old policeman for the past 12 years. There were procedural violations, and its reliability was questionable upon closer inspection. As long as there are rich and powerful lawyers, this kind of evidence is not evidence.

Aso Keiji's home was burned to the ground. After so many years, it is unrealistic to find the words he wrote back then for handwriting identification.

Nishimoto Ken refused to admit it, but Lin Xinyi coldly showed the music score in front of him:
To be continued...