A woman hears a knock on her door at midnight. She finds a stranger who claims to be her long-lost brother. How can she tell if he’s lying?

Category: Mystery · Difficulty: expert

Hint: Think about unique knowledge only a true family member would have.

Answer

He doesn’t know the family secret

Explanation

If he cannot recall a family secret, it indicates he might not be who he claims.

This is a expert mystery riddle — one of the harder riddles here. The answer is He doesn’t know the family secret.

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