Detective Sterling walked into a dark alley where a courier had been robbed. The courier insisted he couldn't see the mugger's face because it was pitch black and the streetlamps were broken. Sterling flicked his cigarette, pointed at the courier's watch, and said, 'You're lying.' What did the watch reveal?
It was a digital watch with an illuminated screen
A glowing digital watch would have provided enough light for the courier to briefly see his attacker's face.
About this riddle
Detective riddles are tiny mysteries. Look for the detail in the story that does not fit; it is usually the clue that solves the case.
Difficulty: Medium. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.
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