A priceless sapphire was stolen from a glass display case in a locked room. The thief left behind muddy footprints leading directly to the window, which was bolted from the inside. The room had a thick layer of dust everywhere except for a clean path leading to the door. Detective Miller smiled and said the footprints were a fake. Why?
The dust
If the room had a thick layer of dust everywhere, any person walking into the room would have left footprints in the dust. The muddy footprints by the window were placed after the floor was cleaned or walked on, but the clean path to the door proved someone walked there without leaving mud.
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: Easy. More like this: Detective riddles with answers or try Truth & Lie Island for a different kind of puzzle.
More detective riddles
In a dimly lit study, Lord Blackwood was shot dead. The calendar on his desk was flipped to November 4th. A cup of steaming hot cocoa sat nearby, along with an open book face down. The detective interviewed three visitors who came that evening: April, who dropped off tax papers; August, who returned a borrowed umbrella; and June, who brought the cocoa. The detective arrested June instantly. What gave her away?
Four friends passed notes. Ana passed to Ben, Ben passed to Cal, Cal passed to Dee. Who got the note last?
Detective Sterling arrived at a desert campsite where an explorer had died of dehydration. The explorer's canteen was completely empty, and his pack contained only a map, a compass, and a sealed bottle of saltwater. Sterling looked at the tracks leading away from the tent and arrested the camp guide for murder. What did the guide do to the water?
An art collector was found shot in his locked gallery. The room had no windows, and the heavy oak door was bolted from the inside. A small puddle of fresh, unfrozen water sat directly beneath the air conditioning vent, even though the AC unit had been unplugged for three weeks. Detective Vance looked at the puddle and solved the murder. What was the weapon?
Detective Cruz investigated a break-in at a high-tech laboratory. The thief bypassed a retinal scanner by using a dead employee's eye. Cruz checked the security log and realized the alarm should have sounded immediately, but it didn't. Why?
An antique dealer reported a break-in, claiming a thief smashed his front window and stole a 19th-century hourglass. Detective Vance noticed shards of glass scattered neatly across the living room rug. He immediately arrested the dealer for insurance fraud. What tipped him off?