Fifteen-year-old Beth's dreams are shattered when she, her brother Sam and baby sister Molly are orphaned. Sam believes that only in America can they make their fortunes so, reluctantly leaving Molly with adoptive parents, brother and sister embark on the greatest adventure of their lives. Onboard the steamer to New York there are rogues aplenty. But Beth's talent with the fiddle earns her the nickname Gypsy - and the friendship of charismatic gambler Theo and sharp-witted Londoner, Jack. And after dodging trouble across America, finally the foursome head for the dangerous mountains of Canada and the Klondike river in search of gold.