CASE ZERO
Case 309

Who is guilty?

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

Sofia: “Cleo is innocent.”
Max: “None of Max, Lily or Cleo is guilty.”
Lily: “None of Sofia, Lily or Ezra is guilty.”
Ezra: “The guilty person is either Max or Lily.”
Cleo: “The guilty person is one of Max, Ezra or Cleo.”
Random case
Solution: Max 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.