"Mary" and "Tom" arrive in New York from Ireland only to find that their uncle "Niall" isn't there to meet them. Indeed, the only acquaintance they do make make hanging around the docks is a small dog that she takes a bit of a shine to and names "Sparky". Concluding that he isn't likely to show up, they decide to take a punt and go to California and find him. Problem? Well the trains don't take punts - only dollars, so they have just an hour to raise the fare. Or... Well maybe they could just blend in with a group of travelling children and blag their way onto the train. It turns out that thes...