A rare diamond was stolen from a locked museum display case. The guard swore nobody entered or left through the doors. The security footage shows the thief walking straight through the solid north wall without breaking it. How did the thief pull off this supernatural feat?
The security footage was in reverse.
If the footage was played backward, a person walking out of the room would appear to be walking straight into the solid wall.
About this riddle
Detective riddles are tiny mysteries. Look for the detail in the story that does not fit; it is usually the clue that solves the case.
Difficulty: Medium. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.
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