A woman hears a knock at her door late at night but finds no one there. How could this happen?

Category: Mystery · Difficulty: expert

Hint: Consider what might create the sound.

Answer

Her reflection knocked the door

Explanation

The woman's reflection could have created an optical illusion, making her think someone was knocking.

This is a expert mystery riddle — one of the harder riddles here. The answer is Her reflection knocked the door.

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