Case 323
The Broken Seal
A tamper seal on a storage crate was cut overnight.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Morgan
“Alex is guilty.”
Drew
“Lane is innocent.”
Alex
“Drew and Harper are both innocent.”
Harper
“Neither Drew nor Lane is guilty.”
Lane
“Drew is innocent.”
Who is guilty?
Solution: Morgan
If Morgan is guilty, Morgan's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.