A signal went off without a sound, prompting action toward an unseen threat. What could this be?
Category: Mystery · Difficulty: hard
Hint: Consider a type of alert that operates quietly.
Answer
A silent alarm
Explanation
A silent alarm can alert authorities without alerting the intruder, allowing for discreet enforcement.
This is a hard mystery riddle — a tricky one that takes a little thought. The answer is A silent alarm.
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