CASE ZERO
Case 196

Who is guilty?

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

Chloe: “Neither Leo nor Kai is guilty.”
Leo: “None of Leo, Kai or Nina is guilty.”
Esme: “Kai is guilty.”
Kai: “Neither Chloe nor Nina is guilty.”
Nina: “The guilty person is one of Chloe, Esme or Kai.”
Random case
Solution: Esme 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.