Case 124
The Vanished Key
A locked evidence cabinet was opened without permission.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Jules
“Morgan is innocent.”
Finley
“Neither Jules nor Morgan is guilty.”
Morgan
“Either Finley or Hayden is guilty.”
Hayden
“Either Finley or Dakota is guilty.”
Dakota
“Hayden is guilty.”
Who is guilty?
Solution: Hayden
If Hayden is guilty, Hayden's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.