Case 297
The Stolen Prototype
A prototype vanished from a secured workroom.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Elliot
“Quinn is innocent.”
Kendall
“Elliot is innocent.”
Quinn
“Neither Elliot nor Kendall is guilty.”
Drew
“Either Kendall or Quinn is guilty.”
Logan
“Drew is guilty.”
Who is guilty?
Solution: Drew
If Drew is guilty, Drew's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.