It is Christmas 1937 when sisters Rowan and Thea travel from London to Scotland to visit their dying father. Having lost their mother in a tragic sailing accident they are accustomed to grief but they have no idea that their father's death will expose a terrible deception...For back in London is his wife Sophie and their two sons. Neither family knows of the other's existence and when news reaches Sophie of Hugh's death her whole world is turned upside down. Meanwhile Rowan's marriage is crumbling and Thea reluctantly finds herself acting as a go-between for her sister and her lover. But with the onslaught of World War II the lives of all three women will change for ever…