CASE ZERO
Case 274

Who is guilty?

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

Ava: “The guilty person is either Nora or Zoe.”
Eli: “The guilty person is one of Ava, Nora or Zoe.”
Nora: “Ava is innocent.”
Miles: “None of Ava, Nora or Miles is guilty.”
Zoe: “None of Nora, Miles or Zoe is guilty.”
Random case
Solution: Zoe 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.