Case 052
The Stolen Watch
A valuable watch disappeared during a private gathering.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Parker
“Cameron and Drew are both innocent.”
Cameron
“Neither Parker nor Jules is guilty.”
Drew
“Cameron and Jules are both innocent.”
Rowan
“Either Cameron or Drew is guilty.”
Jules
“Neither Parker nor Cameron is guilty.”
Who is guilty?
Solution: Rowan
If Rowan is guilty, Rowan's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.