Case 265
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.
Blake
“Either Parker or Riley is guilty.”
Parker
“Riley is guilty.”
Morgan
“Frankie is innocent.”
Riley
“Either Blake or Parker is guilty.”
Frankie
“Either Morgan or Riley is guilty.”
Who is guilty?
Solution: Riley
If Riley is guilty, Riley's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.