In a library, a deadly book was found open on the floor, but the door was locked from the inside. How did the killer manage to escape?

Category: Mystery · Difficulty: expert

Hint: Examine the book's role in the scenario.

Answer

The book revealed a concealed passage.

Explanation

The book was a trap, allowing the killer to escape while the door remained locked from the inside.

This is a expert mystery riddle — one of the harder riddles here. The answer is The book revealed a concealed passage..

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