An alarm failed to sound despite a broken window. What could cause this failure?

Category: Mystery · Difficulty: hard

Hint: Think about intentional actions taken by intruders beforehand.

Answer

Alarm was disabled before break-in

Explanation

The intruder disabled the alarm system ahead of time to avoid detection.

This is a hard mystery riddle — a tricky one that takes a little thought. The answer is Alarm was disabled before break-in.

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