Mac, the Scottie Dog and his Master live a happy life together. Where Master goes, Mac goes. Until one day Master has to meet a man at Paddington Station. The man forces Master onto a train. Mac is left alone on the platform. Who has kidnapped Master and why? Mac does not know what to do until he meets Tosh, a streetwise Boxer. Their adventure together begins when Mac and Tosh stow away aboard a train to follow Master. But will they be able to rescue him from the kidnappers? Will Mac ever see Master again?