日本語
The Locked Room of the Man Behind on His Rent (illustration)
FILE No.13Unsolved

The Locked Room of the Man Behind on His Rent

Difficulty ★★☆about 5 minLocked RoomLocked roomOrder of actions
A man three months behind on rent was found stabbed in a locked room. The blood was wiped up, and the key was in his own pocket.

Case Record

Toda, who lived on the second floor of a wooden apartment building, was three months behind on his rent. The landlord, concerned, visited his room but got no answer. The front door stayed shut for days. Suspicious, the landlord entered with a spare key.

Toda lay dead in the room with a single stab wound to the belly. He had been dead for more than ten days.

The front door was locked from the inside, and the key was in the pocket of Toda’s trousers. Only the landlord had a spare. The room has a single window, firmly locked from the inside. There was no other way in or out. Yet blood had been wiped away in the room, in front of the door and in the alley.

Toda had been planning a trip, so suicide seemed unlikely. The autopsy showed that it took several hours from the stabbing until his death. There was also a rumor that "he resells fake brand goods."

The suspects are four: Aoi, who has judo experience; Kurokawa, who wore a bloodstained T-shirt; Akamatsu, who was seen near the scene; and Shiraishi, who carried a knife for self-defense.

Your question

Who wiped the blood in the room and locked the front door?

Case Files

Evidence

Diagram

The second-floor roomItemStateFront doorLocked from the insideWindowOne only, lockedKeyOne in the victim’s pocket; spare with the landlordWiped bloodAlley, in front of the door, insideFound by the landlord, 10+ days after death.
Diagram

Timeline

  1. Toda is stabbed in the alley (estimated).
  2. Toda dies in his room (estimated).
  3. The landlord enters with the spare key and finds the body.

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

The key was in the victim’s pocket. Who could have used it to lock the door?

Open hint 2

Several hours passed between the stabbing and the death. What was the victim doing then?

Open hint 3

Did the victim have a reason not to call for help?

Solve It

Your question

Who wiped the blood in the room and locked the front door?

Choose the answer closest to the truth.

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The Truth

The victim himself, Toda

The answer is the victim himself, Toda.

Toda was stabbed outside, then fled back to his own room alive for several hours. He locked the door from the inside and wiped the blood himself. Because he had the guilty secret of reselling fake brand goods, he feared that calling the police or an ambulance would expose his business.

The blood in the alley, on the other hand, was wiped up by the person who stabbed him, who tried to erase marks that would lead to himself. The key is in Toda’s pocket because he locked the door from inside and then collapsed. No one ever entered the room, so there was never anyone who "made" a locked room.

From the night of the crime to discovery1. Stabbed in the alley2. Flees back to his room3. Locks the door from the inside4. Wipes up his own blood5. Cannot call anyone; dies hours laterThe alley blood was wiped by the attacker. No one else entered the room.
Diagram of the solution

Key Points

  • There need not be someone who "made" the locked room (it became one as a result)
  • Think of the victim’s actions from the depth of the wound and how long he lived
  • The victim’s secret can be the reason he did not call for help

Why people get fooled

Hearing "locked room" and "wiped blood," you assume the culprit rigged an elaborate locked room. The idea that "the victim locked it himself" never comes up if you see him only as a victim.

Similar tricks

  • The type where the victim’s own actions create the locked room
  • The type where the victim’s secret changes how the case looks

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If you view the truth, this case will not count as solved on your own. Open it anyway?

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