A rare painting was stolen from a gallery on New Year's Eve. The night watchman swore he never left the front lobby, and the security cameras showed no one entering or leaving through the doors or windows. Detective Ray noticed the snow outside was completely undisturbed except for a straight line of footprints coming *out* of the building, but none going in. How did the thief pull this off?
The thief was already inside the building before the snowstorm started, or hid in the building for days.
Footprints coming out of the building mean the thief walked away from it, having entered prior to the snow falling.
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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