Case 179
The Stolen Prototype
A prototype vanished from a secured workroom.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Riley
“Either Noah or Harper is guilty.”
Noah
“Riley is guilty.”
Harper
“Neither Riley nor Hayden is guilty.”
Hayden
“Riley and Peyton are both innocent.”
Peyton
“Neither Harper nor Hayden is guilty.”
Who is guilty?
Solution: Noah
If Noah is guilty, Noah's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.