Case 341
The Missing File
A signed contract file vanished from the archive.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Kai
“Either Harper or Parker is guilty.”
Harper
“Either Kai or Parker is guilty.”
Taylor
“Neither Kai nor Parker is guilty.”
Rowan
“Parker is innocent.”
Parker
“Neither Taylor nor Rowan is guilty.”
Who is guilty?
Solution: Harper
If Harper is guilty, Harper's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.