Case 112
The Empty Safe
A small office safe was found empty in the morning.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Emery
“Either Alex or Jules is guilty.”
Alex
“Morgan is guilty.”
Morgan
“Alex is guilty.”
Jules
“Morgan and Noah are both innocent.”
Noah
“Neither Morgan nor Jules is guilty.”
Who is guilty?
Solution: Alex
If Alex is guilty, Alex's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.