The Cambridge Fens, 1938. Little Rosanna is part of a close-knit Fenland family and the youngest of three cousins. In a time of childhood abandon and adventures on the water, life couldn't be more perfect. But things are not always as they seem. When Rosanna's new baby brother is born, tragedy strikes the family. And, with the outbreak of World War II just around the corner, and a move to the Norfolk countryside, Rosanna's life is changed forever. And, as she and the family grow together, she realises that to find happiness, we sometimes have to break away from the things we know.