Jack Saunders thinks nothing will ever be good again after he is forced to move to New York City. Things begin to change when Riley Caldwell stands up for him against the middle school bully. While the two quickly become friends, Jack can't help feeling that Riley is hiding something.The truth is Riley is descended from a secret legacy of art jumpers. Jack discovers this fact as Riley is about to enter a painting to rescue her grandfather when he fails to return from a jump.Now these two friends will face the adventure of their lives. They must race against time to search for Riley's grandfather and get back home before the portal closes and they are trapped forever in the world of the painting.