Case 268
The Missing File
A signed contract file vanished from the archive.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Drew
“Neither Quinn nor Taylor is guilty.”
Quinn
“Either Cameron or Marley is guilty.”
Cameron
“Taylor is innocent.”
Marley
“Either Cameron or Taylor is guilty.”
Taylor
“Quinn and Cameron are both innocent.”
Who is guilty?
Solution: Marley
If Marley is guilty, Marley's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.