It is early summer and Jumper has lost his master at the train station, after rushing ahead to go sniff around a trash-can. Jumper has to face facts: Francis has gone missing. Jumper sets off on a tracking mission and follows the rails all the way to a little station in the suburbs. He is picked up by Groucho, who takes him to a derelict train which serves as a shelter for abandoned dogs. But Jumper refuses to admit that he has been abandoned. After all, it was his fault he got separated from his master…