A man is found dead in a locked hotel room with a gunshot wound to the head. A gun rests on the floor by his right hand. The window is closed and locked from the inside. There is no suicide note. The air conditioner is humming loudly. Detective Brody walks in, feels the melting ice puddle under the air conditioner vent, and declares it a staged homicide. How did the killer pull it off?
The killer used an icicle as a gun, or used a block of ice to elevate something.
The killer used a large block of ice as a platform to stand on or elevate the weapon, which eventually melted entirely away, leaving no evidence of how the shooter reached the window or exited a locked room.
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.
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