Detective Knox was investigating a break-in at a jewelry store. The owner claimed the thief smashed the glass counter from the outside and grabbed the diamond rings. Knox noticed the broken glass fragments were scattered in a neat semi-circle inside the store, but none were on the sidewalk outside. What did this prove?
The glass was broken from the inside out.
When glass is broken from the outside, shards fall inward. Since the shards were entirely inside, the counter was broken from the inside, debunking the owner's break-in story.
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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