CASE ZERO
Case 063

Who is guilty?

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

Isla: “The guilty person is one of Freya, Cole or Eva.”
Sam: “Isla is innocent.”
Freya: “None of Isla, Freya or Eva is guilty.”
Cole: “None of Isla, Freya or Cole is guilty.”
Eva: “The guilty person is either Freya or Cole.”
Random case
Solution: Cole 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.