I linger in the background yet can be the key; I reveal only when provoked. What am I?

Category: Mystery · Difficulty: hard

Hint: Think about pieces of history that might hold answers.

Answer

An old clue

Explanation

An old clue can resurface at critical moments, providing insights into current mysteries.

This is a hard mystery riddle — a tricky one that takes a little thought. The answer is An old clue.

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