Case 349
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.
Morgan
“Either Casey or Jules is guilty.”
Logan
“Either Parker or Casey is guilty.”
Parker
“Logan and Jules are both innocent.”
Casey
“Either Logan or Jules is guilty.”
Jules
“Parker is innocent.”
Who is guilty?
Solution: Casey
If Casey is guilty, Casey's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.