Mind Skill Games mascot
Mind Skill Games — Sharpen Your Mind, One Game at a Time
Detective riddle

A jewel thief left a mocking note written in waterproof ink on the bottom of an empty swimming pool. The pool had been drained for maintenance for a month. How did the thief write the note at the bottom?

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.

More detective riddles

An antique pocket watch was stolen from a secure display case during a crowded museum gala. Three guests were searched. Lady Pemberton had a silver compact, Lord Blackwood had a gold cigarette case, and Professor Higgins had a heavy brass paperweight. Detective Reed arrested the thief without finding the watch on any of them. Where was the watch, and who took it?

An antique dealer was murdered during a thunderstorm. The suspect claimed he was asleep in his apartment across town when the crime occurred. Detective Sterling checked the suspect's vintage grandfather clock and arrested him. Why?

A rare manuscript was stolen from a glass case that required a four-digit PIN. The curator noted that the PIN was written on a sticky note attached to the back of the computer monitor. Three staff members knew where it was. Inspector Cruz checked the keypad and noticed two buttons had slightly faded paint, while the other eight buttons were pristine. How many digits were actually in the PIN?

Inspector Frost is checking the order in which five suspects left the locked library. Gwen left before Pavel. Jonas left before Mara. Pavel left before Luca. Luca left before Jonas. Who left last?

The security logs for the digital vault showed a breach at 3:00 AM using the master PIN. The CEO was asleep, the head of IT was on a live televised flight over the Atlantic, and the night guard was locked inside a windowless security room with no phone. Who bypassed the vault?

An antique pocket watch was reported stolen from a locked museum display. Security cameras showed no one approaching the case all day. However, Detective Hayes noticed the hour and minute hands were completely missing from the watch face inside the case. What really happened?