CASE ZERO
Case 308

Who is guilty?

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

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