CASE ZERO
Case 083

Who is guilty?

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

Ruby: “Theo is guilty.”
Theo: “None of Theo, Mila or Finn is guilty.”
Mila: “None of Ruby, Mila or Finn is guilty.”
Finn: “None of Ruby, Mila or Jade is guilty.”
Jade: “None of Mila, Finn or Jade is guilty.”
Random case
Solution: Theo 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.