CASE ZERO
Case 361

Who is guilty?

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

Maya: “Iris is guilty.”
Noah: “The guilty person is one of Maya, Owen or Iris.”
Lena: “Noah is innocent.”
Owen: “The guilty person is one of Lena, Owen or Iris.”
Iris: “None of Lena, Owen or Iris is guilty.”
Random case
Solution: Iris 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.