Geraldine Somerville (Lily Potter in the Harry Potter films, Gosford Park) and Academy Award nominees Elizabeth McGovern (Once Upon a Time in America, Ragtime) and Janet McTeer (As You Like It, Tumbleweeds) star in this BBC biopic which explores the secret love life of Daphne du Maurier, author of Rebecca and one of the best-loved writers of all time.

Daphne called herself "a boy in a box" and this revealing drama shows how Daphne's incendiary love life informed her writing. Based on personal letters and biographies, this film charts the story of Daphne's unrequited passion for the beautiful and glamorous American heiress, Ellen Doubleday, and how the play she wrote about this forbidden desire led her to a life-changing love affair with the irreverent, fun-loving actress Gertrude Lawrence.