Case 033
The Missing Ledger
A confidential ledger disappeared from the office.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Drew
“Either Harper or Cameron is guilty.”
Jules
“Either Drew or Harper is guilty.”
Harper
“Jules and Casey are both innocent.”
Cameron
“Either Drew or Casey is guilty.”
Casey
“Either Drew or Cameron is guilty.”
Who is guilty?
Solution: Drew
If Drew is guilty, Drew's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.