CASE ZERO
Case 183

Who is guilty?

Exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.

Isla: “None of Isla, Freya or Cole is guilty.”
Sam: “Neither Isla nor Sam is guilty.”
Freya: “Neither Cole nor Eva is guilty.”
Cole: “The guilty person is either Isla or Sam.”
Eva: “None of Isla, Freya or Eva is guilty.”
Random case
Solution: Sam is guilty. Testing each possible culprit leaves this as the only assignment where the culprit's statement is false and all four innocent statements are true.