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The Entrance That Showed Nothing (illustration)
FILE No.115Unsolved

The Entrance That Showed Nothing

Difficulty ★★☆about 5 minLocked RoomSurveillancePathways
The security camera at the entrance shows no one. Yet the ground outside the window has marks from a ladder's feet.

Case Record

Cash was stolen from a small second-floor office. There is a security camera at the office entrance, and on the night of the incident it recorded continuously without any malfunction. The footage shows no one coming or going.

Outside the office window, however, four deep marks from a ladder's feet were left in the ground. After the incident, the window was unlocked. It was a simple type whose latch could be turned from outside by inserting a thin rod, and muddy shoe prints were on the inside of the window frame.

Your question

Where did the culprit come and go?

Case Files

Diagram

The second-floor office, side viewEntrance (camera)Recorded all night, nobody seenWindowGround: 4 deep ladder-leg marks outside the windowWindow lock: found unlocked. Its latch can be turned from outside with athin rod. Shoe mud on the inside of the frame.
Diagram

Hints

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

Open hint 1

What does the camera film?

Open hint 2

Does not showing someone mean they were not there?

Open hint 3

What was left outside the window?

Solve It

Your question

Where did the culprit come and go?

Choose the answer closest to the truth.

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The Truth

Came and went through the window using a ladder

The answer is "Came and went through the window using a ladder."

The camera did not malfunction and recorded continuously. So it is natural to think the culprit did not pass through there, rather than that it "failed to record."

The deep marks outside the window are evidence that a heavy person set up a ladder. The window can be unlocked from outside, so entering through the window works. The idea of hiding since the daytime cannot explain the way out.

The route used by the culpritClueWhat it showsCamera recording continuously, nofaultNobody used the entrance4 deep leg marks outside thewindowA heavy person set up a ladderWindow latch can be turned fromoutsideA way in through the windowMud on the inside of the frameEntered through the windowAnswer: in and out through the window, using a ladder.
Diagram of the solution

Key Points

  • The camera covers only part of the entrances
  • Not on camera does not mean not there
  • Marks on the ground outside are records too

Why people get fooled

Because when nothing appears on a security camera, you want to believe nobody entered.

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