Case 193
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.
Logan
“Casey is innocent.”
Reese
“Neither Finley nor Casey is guilty.”
Finley
“Neither Logan nor Reese is guilty.”
Casey
“Either Logan or Quinn is guilty.”
Quinn
“Logan is guilty.”
Who is guilty?
Solution: Quinn
If Quinn is guilty, Quinn's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.