Ed Frost is testing his brand new telescope on the nearby hills when he spots a shadowy figure. Unusually, the stranger stops walking, leaves something behind and returns the way he came. Ed and his best friend Bertie investigate. They struggle but finally find an old sack. Inside are two terrified Welsh terrier pups, left for dead. Ed names one Moondust and the other Meteor. Moondust soon becomes a much loved member of the family, while Meteor's life hangs in the balance. By chance, Ed spots an advert for puppies in the local newspaper. He phones the number on the advert, pretending to be interested in buying a pup. The pups are being sold at a local farm. Ed and Bertie go to the farm on a spying mission. On the way they meet an old foe. He has been upset by his older brother who is renting the farm and selling the puppies in a heartless money-making business. The boys make an unexpected friendship and when they arrive to spy at the farm they are disgusted by what they see - bedraggled underfed pups, kept in dirty and cramped conditions - a cruel death camp for dogs. A courageous and daring race for life begins. Can they rescue the pups and bring the sinister operator to justice?