A diamond necklace vanished from a high-security vault. The night watchman claimed he saw a ghost float through the laser grid, grab the necklace, and vanish into thin air. Detective Sterling examined the laser grid emitter and immediately arrested the watchman for insurance fraud. What did Sterling discover?
The lasers were positioned too low
If a ghost (or person) floated *through* the laser grid, they would have broken the beams. However, if the watchman staged it, he likely disabled the lasers or knew the code. Wait, the watchman said the ghost floated *through* the grid. If it floated, it wouldn't touch the floor, but lasers cover the whole room. Sterling discovered the laser beams were set at waist height, meaning anyone walking normally would trip them, but crawling or floating below them wouldn't trigger them unless... wait. Sterling arrested the watchman because the watchman turned off the lasers using his own security code, leaving no alarm triggered.
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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