Case 158
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.
Riley
“Neither Blake nor Noah is guilty.”
Reese
“Riley is innocent.”
Finley
“Either Riley or Reese is guilty.”
Blake
“Riley and Reese are both innocent.”
Noah
“Neither Reese nor Blake is guilty.”
Who is guilty?
Solution: Finley
If Finley is guilty, Finley's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.