At a closed gathering, a secret is shared. One person's reaction is vital in revealing the truth. What detail to observe?

Category: Mystery · Difficulty: hard

Hint: Look for involuntary signs of emotion.

Answer

Facial expressions

Explanation

Facial expressions often reveal true feelings, even if the person tries to hide them.

This is a hard mystery riddle — a tricky one that takes a little thought. The answer is Facial expressions.

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