CASE ZERO
Case 221

Who is guilty?

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

Sofia: “Neither Max nor Lily is guilty.”
Max: “The guilty person is one of Sofia, Lily or Cleo.”
Lily: “Ezra is innocent.”
Ezra: “The guilty person is one of Sofia, Ezra or Cleo.”
Cleo: “The guilty person is either Sofia or Ezra.”
Random case
Solution: Cleo 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.