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Detective riddle

A priceless diamond was stolen from a glass display case in a locked gallery. The curator claimed the thief must have used a glass cutter because the front pane was shattered inward. Detective Thorne looked at the glass shards lying entirely on the outside gallery floor and arrested the curator immediately. Why?

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: Easy. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.

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