The body of strangled fortune teller Barbara Sadako is discovered in an old building. On her computer is a text document with the words, "I was nearly killed again. Which one of those three did it? Is it K? Is it E? Is it S?" Former construction worker Kanawa Shinsuke, officer worker Endo Fukami, and former ramen restaurant owner Sazanami Ryoichi emerge as suspects, all of whom had miserable experiences as a result of Sadako's fortune telling. Evidence suggesting all three did it is discovered one after another, but Conan finds it strangely convenient that evidence incriminating all three of them was found...