Case 352
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.
Elliot
“Either Drew or Kendall is guilty.”
Alex
“Drew and Kendall are both innocent.”
Drew
“Kendall is innocent.”
Kendall
“Alex and Drew are both innocent.”
Taylor
“Neither Drew nor Kendall is guilty.”
Who is guilty?
Solution: Elliot
If Elliot is guilty, Elliot's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.