Case 214
The Missing Painting
A framed artwork disappeared from a private hallway.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Marley
“Kendall and Harper are both innocent.”
Kendall
“Jules and Harper are both innocent.”
Avery
“Either Marley or Harper is guilty.”
Jules
“Either Marley or Avery is guilty.”
Harper
“Marley and Jules are both innocent.”
Who is guilty?
Solution: Avery
If Avery is guilty, Avery's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.