Case 043
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.
Drew
“Neither Sam nor Harper is guilty.”
Marley
“Either Sam or Noah is guilty.”
Sam
“Harper and Noah are both innocent.”
Harper
“Neither Drew nor Noah is guilty.”
Noah
“Either Marley or Sam is guilty.”
Who is guilty?
Solution: Marley
If Marley is guilty, Marley's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.