Case 284
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.
Quinn
“Either Reese or Drew is guilty.”
Jules
“Drew is innocent.”
Reese
“Either Quinn or Finley is guilty.”
Finley
“Either Quinn or Jules is guilty.”
Drew
“Reese and Finley are both innocent.”
Who is guilty?
Solution: Quinn
If Quinn is guilty, Quinn's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.