Set between present day London and the idyllic Norfolk countryside in the lead up to the Second World War. Glorious 39 centres around the Keyes family, keen to uphold and preserve their very traditional way of life at a time of uncertainty and high tension.
The eldest sibling Anne is a budding young actress, in love with Foreign Office official Lawrence, but her seemingly perfect life begins to dramatically unravel when she stumbles across secret recordings of the pro-appeasement movement. As her close friends begin to die in suspicious circumstances, she finds her own life in danger from an increasingly menacing and powerful enemy.