Case 334
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.
Emery
“Taylor is innocent.”
Taylor
“Emery is innocent.”
Avery
“Either Emery or Jules is guilty.”
Jules
“Emery is guilty.”
Frankie
“Avery is innocent.”
Who is guilty?
Solution: Jules
If Jules is guilty, Jules's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.