Case 131
The Stolen Prototype
A prototype vanished from a secured workroom.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Emery
“Frankie is innocent.”
Kai
“Frankie and Alex are both innocent.”
Frankie
“Kai and Alex are both innocent.”
Alex
“Either Kai or Jordan is guilty.”
Jordan
“Either Emery or Kai is guilty.”
Who is guilty?
Solution: Jordan
If Jordan is guilty, Jordan's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.