CASE ZERO
Case 007

Who is guilty?

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

Isla: “The guilty person is either Isla or Cole.”
Sam: “The guilty person is one of Sam, Freya or Cole.”
Freya: “Neither Isla nor Freya is guilty.”
Cole: “None of Sam, Cole or Eva is guilty.”
Eva: “Eva is innocent.”
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.