During a blackout, a priceless diamond necklace vanished from a high-security display case. Three suspects were interrogated. Anna said, 'I was reading a book with a flashlight.' Ben said, 'I was sleeping in the corner.' Carla said, 'I was fixing the backup generator in the basement.' The detective arrested Carla before checking her pockets. What gave her away?
The backup generator
If the backup generator was actually being fixed, the lights would have come back on immediately, but the blackout continued throughout the theft.
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 jewel smuggler claimed his luggage was stolen right off the airport baggage carousel while he was visiting the restroom. Detective Cole asked him to describe his suitcase. The smuggler replied, 'It's a large black hard-shell suitcase with a cracked left wheel and a neon pink luggage tag.' Cole smiled and arrested him for filing a false police report. What did Cole realize?
An old lighthouse keeper was found dead at the base of the winding indoor staircase. The coroner noted he suffered a broken neck from a fall. The local sheriff ruled it an accidental fall due to old age. The detective visited the lighthouse, looked at the spiral stairs, and ordered a murder investigation. What did the detective see?
A jeweler reported a night robbery. The front window was smashed inward, and sparkling diamonds were strewn across the sidewalk outside. Detective Vance looked at the glass shards lying on top of the diamonds on the pavement and shook his head. What was wrong with the crime scene?
A jeweler was murdered in his store. On the glass counter, someone had hastily smeared three letters in blood: J, O, and Y. The three primary suspects were Jason, Oliver, and Yvonne. Inspector Cole immediately arrested Yvonne. Why?
A rare manuscript was stolen from a glass-domed table. The security camera showed a man walking up to the table, placing his hands flat on the glass, and walking away empty-handed. Yet, the manuscript vanished. How did he steal it?
A rare painting was stolen from a gallery while the curator was eating lunch. The suspect claimed he spent the entire hour buying groceries across town, presenting a receipt timestamped 12:15 PM. Detective Hayes arrested him on the spot. Why?