A spy used a peculiar tool to hear conversations through walls without being detected. What was this device actually?
Category: Story · Difficulty: hard
Hint: Think about medical instruments repurposed cleverly.
Answer
A stethoscope contacting surfaces
Explanation
The spy used a stethoscope pressed against walls to detect vibrations from speech, enabling eavesdropping without electronic gadgets.
This is a hard story riddle — a tricky one that takes a little thought. The answer is A stethoscope contacting surfaces.
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