Case 258
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.
Jules
“Peyton is guilty.”
Taylor
“Marley is innocent.”
Parker
“Jules is guilty.”
Peyton
“Taylor and Parker are both innocent.”
Marley
“Neither Taylor nor Peyton is guilty.”
Who is guilty?
Solution: Jules
If Jules is guilty, Jules's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.