A jewel thief claimed he spent the entire night of the robbery sailing alone on his yacht under the moonlight. The detective checked the weather report and immediately called him a liar. Why?
It was a new moon / cloudy night
The detective likely checked astronomical data and found there was no moonlight that night, or the weather was overcast, proving the alibi false.
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 wealthy merchant reported his diamond necklace stolen from a velvet display box. The night watchman stated he patrolled the hallway every twenty minutes and saw the necklace sparkling in the moonlight through the glass window the entire night. Detective Ray arrested the watchman immediately. Why?
A priceless diamond was stolen from a locked display case. The guard swore nobody approached it. Detective Miller noticed a faint puddle of melted ice cream directly beneath the case, yet the AC was broken and the room was 90 degrees. Who took the diamond?
Detective Miller walked into the dimly lit hotel room. A man sat at the desk, a poison dart lodged in his neck. The room had only one door, bolted from the inside, and a window sealed shut with old paint that hadn't been opened in years. There were no blowdarts, pipes, or hidden launchers anywhere in the room. Puzzled, Miller looked up at the ceiling and found the answer. What did he see?
At midnight, a wealthy collector was shot in his study. The security log showed only three visitors that evening: the maid who delivered tea, the gardener who fixed the window, and the chef who brought dessert. The maid claims she was dusting the bookshelf, the gardener claims he was trimming the hedge outside, and the chef claims he was tasting soup. Detective Cole immediately arrested the gardener. Why?
A museum guard reported being tied up and gagged by art thieves at 10 PM. Detective Owens arrived and noticed the guard's digital wristwatch was still beeping loudly with its hourly chime set for 11 PM. Owens smiled and arrested the guard for staging the robbery. Why?
Detective Holmes inspected a crime scene where a victim sat at a wooden table with a cup of hot coffee. The coffee was stone cold, yet there was a fresh layer of steam condensation on the inside of the glasses the victim wore. How is this possible?