A compass points north, but the detective notices it spins wildly when near a specific object. What could that object be?

Category: Mystery · Difficulty: hard

Hint: Consider what disrupts magnetic fields.

Answer

A hidden magnetic device

Explanation

The compass's erratic behavior indicates the presence of an artificial magnetic field nearby.

This is a hard mystery riddle — a tricky one that takes a little thought. The answer is A hidden magnetic device.

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