Kogoro is hired by three different clients to perform the same job: protect the racing horse White Spirits. Conan believes there's more to these requests than meets the eye. Later, Kogoro meets with company president and owner of the horse Tokuyoshi to explain the situation. After hearing his story, Tokuyoshi also hires Kogoro to perform the same job. The next day, White Spirits is transported by trailer to the track in order to race, but... when the trailer arrives, the horse that comes out of it is a different horse that looks a lot like White Spirits...

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...