Case 188
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.
Quinn
“Neither Reese nor Jules is guilty.”
Drew
“Neither Quinn nor Jules is guilty.”
Reese
“Jules is innocent.”
Jules
“Reese is innocent.”
Logan
“Either Drew or Reese is guilty.”
Who is guilty?
Solution: Logan
If Logan is guilty, Logan's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.