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Detective riddle

A jewel thief left a calling card at every crime scene: a drop of fresh morning dew on a fake rose. Detective Lane smiled and caught the suspect because the robberies happened at midnight inside windowless underground vaults. What exposed the thief's fake alibi?

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: Easy. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.

More detective riddles

An antiques dealer was murdered in his shop. A shattered hourglass lay beside him on the Persian rug, its sand spilled out in a small heap. The shop's front door was locked from the inside with a deadbolt. Detective Vance noticed that the sand in the bottom bulb of the hourglass was completely dry, but the top bulb had a faint ring of moisture inside. He immediately suspected foul play involving a freezer. How?

Inspector Miller entered a cabin in the woods where a man hung by his neck from a sturdy rafter. The floor directly beneath the dead man was completely dry, clean, and free of any furniture, boxes, or stools. There were no trapdoors or ladders anywhere in the cabin. How did the man reach the rafter?

A vintage sports car crashed into a brick wall. The driver was found dead in the passenger seat. The steering wheel was completely undamaged, but the glove compartment was locked. Detective Miller knew instantly this wasn't a driving accident. What gave it away?

Detective Miller walked into a dimly lit diner where a robbery had just occurred. The cashier insisted the masked robber wore heavy winter gloves and a thick wool scarf despite it being a scorching 95 degrees outside. Miller nodded and said, 'That's how I know you staged this.' What was the flaw in the cashier's lie?

Inspector Vance found the victim slumped over a desk with a fresh cup of coffee. The victim's left hand held a pen, resting on a notepad with the words 'The winter chill is here.' The apartment windows were sealed shut, the thermostat read 85 degrees Fahrenheit, and frost coated the outside of the glasspane. Yet, the radiator was completely cold. Why did Vance immediately arrest the landlord for foul play?

A rare manuscript was stolen from the university library. The thief left behind a muddy footprint near the window. The three student suspects—Nora, Owen, and Penny—all wore identical rubber boots. Nora claimed she was in the library all night. Owen said he walked across the campus quad. Penny said she stayed in her second-floor dorm room. Detective Zane arrested Penny. Why?