Sabrina takes a holiday idea from Salem and brings her friends on the spooky Mystery Train for a Halloween adventure. There's just one problem: It's in the Other Realm. Sabrina soon learns that the mortals can leave only if she solves the puzzling mystery when she goes back into something out of a 1920 mystery movie.

Sabrina faces the wrath of Zeus when she uses her magical powers to help her ex-boyfriend Harvey afterhe gets a hockey injury and needs help, so Sabrina goes to Mercury to get the god's special ice skates. But Sabrina has to pay the deity back when Harvey's coach has the skates bronzed to celebrate the team's victory.