Case 066
The Empty Safe
A small office safe was found empty in the morning.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Marley
“Neither Reese nor Lane is guilty.”
Parker
“Either Finley or Reese is guilty.”
Finley
“Marley and Lane are both innocent.”
Reese
“Neither Marley nor Lane is guilty.”
Lane
“Neither Marley nor Reese is guilty.”
Who is guilty?
Solution: Parker
If Parker is guilty, Parker's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.