CASE ZERO
Case 313

Who is guilty?

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

Maya: “The guilty person is one of Maya, Noah or Owen.”
Noah: “The guilty person is one of Noah, Owen or Iris.”
Lena: “Neither Lena nor Iris is guilty.”
Owen: “Iris is guilty.”
Iris: “Neither Maya nor Lena is guilty.”
Random case
Solution: Owen 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.