Case 221
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
“Jordan and Casey are both innocent.”
Jordan
“Neither Avery nor Casey is guilty.”
Avery
“Either Elliot or Logan is guilty.”
Logan
“Either Elliot or Jordan is guilty.”
Casey
“Avery is innocent.”
Who is guilty?
Solution: Logan
If Logan is guilty, Logan's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.