Case 252
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.
Elliot
“Either Drew or Blake is guilty.”
Peyton
“Either Elliot or Drew is guilty.”
Drew
“Blake is guilty.”
Blake
“Drew is guilty.”
Marley
“Peyton is innocent.”
Who is guilty?
Solution: Drew
If Drew is guilty, Drew's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.