Case 320
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.
Noah
“Casey is innocent.”
Morgan
“Neither Noah nor Parker is guilty.”
Parker
“Either Casey or Peyton is guilty.”
Casey
“Parker is innocent.”
Peyton
“Either Noah or Casey is guilty.”
Who is guilty?
Solution: Peyton
If Peyton is guilty, Peyton's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.