Case 029
The Lost Access Card
A master access card was taken from the reception desk.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Cameron
“Either Sam or Rowan is guilty.”
Avery
“Sam and Rowan are both innocent.”
Sam
“Cameron is guilty.”
Rowan
“Neither Avery nor Kendall is guilty.”
Kendall
“Either Cameron or Sam is guilty.”
Who is guilty?
Solution: Cameron
If Cameron is guilty, Cameron's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.