CASE ZERO
Case 244

Who is guilty?

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

Chloe: “The guilty person is either Leo or Nina.”
Leo: “Neither Chloe nor Esme is guilty.”
Esme: “The guilty person is one of Leo, Esme or Nina.”
Kai: “The guilty person is one of Chloe, Esme or Nina.”
Nina: “Neither Kai nor Nina is guilty.”
Random case
Solution: Nina 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.