Case 041
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.
Cameron
“Frankie is guilty.”
Frankie
“Neither Jules nor Parker is guilty.”
Jules
“Frankie is innocent.”
Elliot
“Either Cameron or Frankie is guilty.”
Parker
“Cameron is guilty.”
Who is guilty?
Solution: Cameron
If Cameron is guilty, Cameron's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.