During a handover to the head of counter-terrorism of MI5, Harry Pearce, a terrorist escapes custody. When Harry disappears soon after, his protégé is tasked with finding out what happened as an impending attack on London looms, and eventually uncovers a deadly conspiracy.

In the glamour of 1950s post-war London, renowned dressmaker Reynolds Woodcock and his sister Cyril are at the center of British fashion. Women come and go through Woodcock’s life, providing the confirmed bachelor with inspiration and companionship, until he comes across a young, strong-willed woman, Alma, who soon becomes a fixture in his life as his muse and lover. Once controlled and planned, he finds his carefully tailored life disrupted by love.