A detective hears a strange sound from a sealed vault. When opened, nothing is missing, but the sound repeats every hour. What causes it?
Category: Mystery · Difficulty: expert
Hint: Think about concealed mechanical devices.
Answer
A hidden clock mechanism ticking
Explanation
A hidden clock inside the vault caused periodic ticking sounds without any item missing.
This is a expert mystery riddle — one of the harder riddles here. The answer is A hidden clock mechanism ticking.
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