A shipping magnate was found dead in his private office aboard his yacht. The cabin door was bolted from the inside. Through the porthole, Detective Drake saw the magnate slumped over his desk. A heavy iron safe was wide open, and gold coins were scattered across the floor. Drake noticed the yacht's anchor was dropped in the middle of a calm, deep lake, yet the engine was running at full throttle. What did this indicate?
The yacht was going nowhere while burning fuel, creating a massive distraction or noise cover.
Dropping an anchor while running the engine at full throttle keeps the boat stationary while creating tremendous engine roar and vibration, drowning out any sounds of a struggle or a break-in from the outside.
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: Hard. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.
More detective riddles
A rare emerald necklace vanished from a high-security vault. The chief of security claimed he opened the vault at 8 AM and found it empty. The vault door has a complex dual-key mechanism requiring both the manager's key and the guard's key to turn simultaneously. Both keys were accounted for, and neither man left their post. Detective Drake proved the security chief staged the theft. How?
A priceless ruby necklace vanished from a hotel suite. The maid stated she changed the linens at 10:00 AM. The bellhop stated he delivered room service at 11:30 AM. The guest stated she discovered the theft at 1:00 PM when she returned from swimming. Detective Vance checked the balcony door and noticed the patio chairs were covered in heavy morning dew, except for a clean, dry circular patch on one cushion. Vance solved the case. What happened?
A woman was found poisoned at a dinner party. Everyone drank from identical wine glasses, but she was the only one who died. She drank her wine very quickly, while the others sipped slowly. How did the killer target only her?
Three brothers—Arthur, Brian, and Charles—shared a mansion. Arthur was found poisoned in the library. Brian claimed he was outside jogging in the snow, leaving fresh footprints. Charles claimed he was inside baking fresh bread. Detective Reed looked at the melting snow on Brian's boots and the flour on Charles's apron, then arrested Charles. What gave Charles away?
During a summer heatwave, a jeweler was found unconscious behind his counter. The front door was locked from the inside, and the air conditioning was blasting ice-cold air. On the floor lay a pool of melted ice water near a shattered lightbulb. The detective smiled and said, 'An inside job.' What gave the thief away?
A rare manuscript was stolen from a library shelf. The thief left behind a pair of muddy boots. The librarian stated that it had been pouring rain outside all afternoon, and every visitor tracked mud inside. However, the detective noticed the mud on the boots was completely dry and chalky white. Where did the thief actually come from?