It is 1957. As Daphne du Maurier wanders alone through her remote mansion on the Cornish coast, she is haunted by thoughts of her failing marriage and the legendary heroine of her most famous novel, "Rebecca", who now seems close at hand. Seeking distraction, she becomes fascinated by Branwell, the reprobate brother of the Bronte sisters, and begins a correspondence with the enigmatic scholar Alex Symington in which truth and fiction combine. Meanwhile, in present day London, a lonely young woman struggles with her thesis on du Maurier and the Brontes and finds herself retreating from her distant husband into a fifty-year-old literary mystery.