National Destiny Delta: Starting with a naked AK, it splashes across the globe.

"What is your first reaction when you see someone hanging themselves?"

Ye Han then posed a rather common-sense question.

"Then we should definitely put that person down and check if they're breathing, right?"

Luna understood halfway through her question why Ye Han suspected Tom.

"Yes, that's why I'm more suspicious of him."

Ye Han initially didn't want to suspect Tom, but after putting himself in Tom's shoes, he came to the conclusion that Tom's behavior was too abnormal.

That's why Ye Han started with Tom, and thus came to this conclusion.

“Some things are not as complicated as we think. It’s possible that there was no complicated locked room in the first place, and it was just a simple locked room.”

Ye Han's thoughts drifted to a book, namely "Three Coffins".

In Chapter 17 of his classic 1935 novel, The Three Coffins, John Dickson Carr delivered his famous "Lectures in the Locked Room" through the voice of Detective Gideon Phil.

John Dickson Carr categorized locked-room murders into thirteen types:

Category 1: Accidents and Coincidences

Category Two: Psychological Coercion

Category 3: Indoor mechanisms

Category 4: Fake Suicide

Category 5: Illusions and Disguise

Category 6: Remote Crimes

Category 7: Time Tricks

Category 8: Key Trick

Category 9: Disassembling the hinge

Category 10: Door latch mechanism

Category 11: Locking Mechanisms

Category 12: Key Carrying

Category 13: Key Return

The first to seventh categories are known as the first major category, where the murderer is not in the locked room.

Categories eight through thirteen are known as the second major category, where the murderer fakes a "locked room" situation within the locked room.

Therefore, if Ye Han wants to find the murderer, he must start with the first category.

The Nick Bock Hotel murder case used an indoor mechanism.

The killer used pre-installed, inconspicuous mechanical devices or traps in the room (such as a telephone with a hidden handgun or a chair with a poison needle) to carry out the murder.

"Then let me make a bold analysis: the jump rope in the victim's room at the beginning was half a section of A plus a complete section of B. It was only after the murderer killed the victim that it was made into A+B. Then everything makes sense."

Just then, Judy stepped forward.

"Ye Han, how can you be so sure that Tom is the murderer? Now that Tom is dead, are you going to go to hell and ask him?"

Judy, being an impatient person, doesn't care about reasons or anything; she'll only protect her friends.

"Okay, you don't believe me? I'll tell you."

At this moment, Ye Han displayed the surveillance footage on the big screen. Although the footage was difficult to see, Ye Han still noticed it.

"The second button from the top on Tom's chest shifted after he entered the deceased's room. It was fine when he went in, but it was hanging in mid-air when he came out."

The scratches on the middle and ring fingers of the right hand are also quite obvious, indicating that this is the only place on the body where there are signs of a struggle.

So the situation at the scene was roughly this: Tom first knocked South Keehan unconscious with a heavy blow, and before South Keehan lost consciousness, he struggled and his hand got caught on Tom's button.

Tom then hanged South Keehan while he was unconscious, so there were no signs of resistance at the scene.

After Ye Han finished speaking, everyone present applauded.

This was the result of Ye Han watching the surveillance footage all night. He stared at every frame and finally found this flaw.

"Miss Judy, do you have anything else to say?"

Judy was stunned by Ye Han's question. Although the evidence was conclusive, she certainly couldn't back down on the surface.

"You made up the phrase 'button hanging in mid-air,' you must have used some unfamiliar words to fool me."

Ye Han finally laughed after hearing this. You can come up with an excuse, right?

"Alright, the evidence collection is very simple now. Tom came to the National Games venue without changing his clothes."

The conclusion can be drawn simply by comparing the scratches on the deceased's fingernails with the marks on Tom's button.

After Ye Han finished recounting the first case, everyone in the room applauded, while the audience on the other side of the screen all stood up.

"Alright, now I'll explain the second case."

Although Ye Han had finished speaking, there was still a second shooting incident to report.

"The reaction of gunpowder is actually very easy to avoid; all we need is an umbrella."

Ye Han analyzed that he had already handed over all the umbrellas in the umbrella cage to the police, otherwise it would be bad if the murderer found them and destroyed them.

"Sister Jifeng, could you please go and buy an umbrella? Remember to buy a big one."

Ye Han told Ji Feng to buy an umbrella, as Luna already had a pistol.

"Oh right, it's the umbrella for rain protection, don't buy the wrong one."

After thinking for a while, Ye Han still offered a reminder.

"What is Ye Han thinking? He's a lunatic."

Luna didn't know why, but she seemed to understand what Ye Han meant by those words, and she cursed inwardly.

Soon, Gale returned with the umbrella; she had even found an extra-large one.

"Then it's very simple. We just need to poke a hole in the center of the umbrella with the gun and then shoot someone."

"Luna, just find an open space and fire a shot."

After Luna fired the gun, she immediately went to get a gunpowder reaction test.

"Alright, while we wait for the results, let's talk about the killer's complete route."

First, David encounters Tom in the toilet and then shoots and kills him. Of course, there is also time for David to fight with the murderer.

The killer then murdered Tom, ran quickly to the shoe cabinet and umbrella cage, hid the umbrella in the umbrella cage, and then slipped back to the competition venue, forming a perfect closed loop.

As for how he held the umbrella, he naturally held it open with the sides facing outwards. This way, no gunpowder reaction would be detected, and it also aligns with David's account of the crime scene.

Just as Ye Han finished speaking, the clever Lucy raised a question.

"That doesn't make sense. If that's the case, shouldn't the gun at the scene have the killer's fingerprints? Why are there only Officer David's fingerprints on it?"

Chapter 171 A Good Deal

"It's very simple. The murderer used water-soluble gloves, which are disposable gloves made of polyvinyl alcohol."

These gloves dissolve in water. If the murderer throws the gloves into a stream after killing someone, they will dissolve into a glue-like liquid in the drainpipe and then be washed away by the water.

That way, there won't be any fingerprints on the gun; that's the killer's method.

After Ye Han finished speaking, Lucy suddenly realized, "So that's how it is."

"There were no fingerprints on the gun, so how did you know who the murderer was?"

Now Lucy no longer questions Ye Han; what Ye Han said does make sense.

"It's very simple, just look at this photo."

Ye Han took out a photo with a shoe print on it.

"A simple comparison at the scene will tell us whose it is. This shoe print was found near the shoe cabinet, which is the place the murderer would have had to go through on the murderer's route."

The shoe print was still wet, so it's the closest one. Now we just need to compare it to the answer key to find out what we're looking for.

After Ye Han finished speaking, Stephen sealed off the scene and began the comparison.

Half an hour later, the murderer was found; it was Anmis from Italy.

“Mr. Anmis, please come with us.”

Everyone present looked at Anmis and instinctively moved away from him.

"Hmph, you ants think you can catch me?"

After finishing speaking, Anmis took out a smoke bomb from his pocket, intending to use it to escape.

"what?"

Stephen was about to stop them when he discovered that the smoke had just cleared and the Anmis had already fled.

"Hmph, you think you can catch me?"

Anmis ran away as fast as he could, and just as he was about to grab the doorknob, a hand slammed the door shut.

"You still want to run away? I've been waiting for you."

Ye Han held the door with one hand and leaned his other shoulder against it, looking at Anmis with a mocking expression.

"Huh? Do you know that even without a gun, you're still no match for me?"

Anmis stared fiercely at Ye Han, a small knife appearing out of thin air in her hand.

"I know, but it's not like I'm fighting you."

Luna and Jifeng, the young couple, had been waiting for Ye Han for quite some time.

Gale thrust out an electric spike and stabbed it into Anmis's chest.

"Ughhhhh~"

The electric shock caused Anmis considerable pain, and Luna then took out a rope and tied Anmis up.

"Don't run away, just go and eat your prison food."