Case 300
The Cut Cable
A network cable was cut in a restricted room.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Frankie
“Marley and Dakota are both innocent.”
Sam
“Dakota is guilty.”
Marley
“Frankie is innocent.”
Rowan
“Either Frankie or Sam is guilty.”
Dakota
“Either Sam or Rowan is guilty.”
Who is guilty?
Solution: Sam
If Sam is guilty, Sam's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.