Sabrina is fed up with her friends' unenthusiastic attitudes towards Halloween so she plans for them to go on a Halloween Murder Mystery Train. But she doesn't realize it's a magical train that turns them into their characters: Sabrina as the detective; Harvey as 'Biff Buffington' - tennis champion; Morgan as an English countess; Roxie as Hortense, the countess's maid; Miles as a foreign professor and Josh as a photographer. And Josh is the murder victim.