No witnesses saw a crime, but a faint smell lingers at the scene. What can it reveal?

Category: Mystery · Difficulty: hard

Hint: Certain chemicals can uniquely link to people or places.

Answer

Chemical scent identifies the perpetrator

Explanation

The scent is linked to a rare chemical used by the criminal, providing a vital lead.

This is a hard mystery riddle — a tricky one that takes a little thought. The answer is Chemical scent identifies the perpetrator.

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