It's a summer's morning in 1988 and Tory politician Robin Hesketh has returned home to the idyllic Cotswold house he shares with his wife of 30 years, Diana. But all is not as blissful as it seems. Diana has a stinking hangover, a fox is destroying the garden, and secrets are being dug up all over the place. As the day draws on, what starts as gentle ribbing and the familiar rhythms of marital scrapping quickly turns to blood-sport.