Case 147
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.
Noah
“Harper and Jordan are both innocent.”
Harper
“Neither Riley nor Jordan is guilty.”
Cameron
“Either Noah or Harper is guilty.”
Riley
“Neither Harper nor Jordan is guilty.”
Jordan
“Riley is innocent.”
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.