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The Cat Door (illustration)
FILE No.175Unsolved

The Cat Door

Difficulty ★☆☆about 5 minLocked RoomAnimalsPathways
A ring vanished from a locked room. Under the door is a small cat flap.

Case Record

A ring in a jewelry box disappeared from a locked room. The door and windows are closed from the inside. At the bottom of the door is a small flap (20 cm by 20 cm) big enough for the pet cat to pass. It is too small even for an adult's wrist, and the ring was on a shelf at the back of the room, out of reach from the flap.

The only one in the room was the pet cat. In the hallway were a small ornament from the ring and cat paw prints.

Your question

How did the ring get out of the room?

Case Files

Diagram

Locked room and cat flapRoom (locked inside)ShelfCat flap 20 × 20 cmCorridor: ornament and paw printsAn arm through the flap cannot reach the shelf. Only the cat was inside.
Diagram

Hints

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

Open hint 1

Is the small flap big enough for a person to pass?

Open hint 2

What was left in the hallway?

Open hint 3

What animal was in the room?

Solve It

Your question

How did the ring get out of the room?

Choose the answer closest to the truth.

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The Truth

The cat took the ring in its mouth and carried it out through the small flap

The answer is "The cat took the ring in its mouth and carried it out through the small flap."

The small flap is 20 cm by 20 cm and an adult's hand does not fit. The cat's paw prints in the hallway and the ring's ornament are traces of the cat carrying it. Cats like shiny things.

There is no mention of the door lock or windows having been broken.

The cat carried itCat takes the ringExits via the flapOrnament and printsin the corridorToo small for a human hand; only cat traces remain.
Diagram of the solution

Key Points

  • Think about small passages
  • Animals act too
  • Connect the traces that remain

Why people get fooled

Because you assume the culprit is a human.

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