Case 067
The Broken Seal
A tamper seal on a storage crate was cut overnight.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Parker
“Harper is guilty.”
Harper
“Jules is innocent.”
Jules
“Either Parker or Harper is guilty.”
Lane
“Harper is innocent.”
Kai
“Harper and Jules are both innocent.”
Who is guilty?
Solution: Parker
If Parker is guilty, Parker's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.