British aristocrat and writer Vita Sackville-West and diplomat Harold Nicolson married in 1913, and their love endured and deepened over the course of their 50 years together. Each, however, was knowingly and repeatedly unfaithful to the other, Vita most famously with fellow writer Virginia Woolf. But only one affair threatened their union: Vita’s tempestuous liaison with her childhood friend Violet Keppel. This BBC drama is the story of that affair based on the extraordinary literary biography by Nigel Nicolson, Vita and Harold’s son.

Award-winning actress Janet McTeer (Tumbleweeds, Carrington) stars as Vita with David Haig (Two Weeks Notice) as Harold, and Cathryn Harrison (Clarissa) as Violet.