Set against the turbulent backdrop of Forties London, The Night Watch tells the stories of four young Londoners inextricably linked by their wartime experiences. In a time when the barriers of sexual morality and social convention have been broken down, Kay (Anna Maxwell Martin), Helen (Claire Foy), Viv (Jodie Whittaker) and Duncan (Harry Treadaway) enjoy a freedom never experienced before as they engage in secret liaisons and passionate trysts. The drama opens in 1947 as the country is trying to rebuild itself after the war; we find Kay mysteriously roaming the streets, haunted by some traumatic personal loss. Meanwhile, Helen and Viv run a marriage bureau, helping people rebuild their shattered lives by finding love. But their own complicated love lives are less easy to solve. Helen obsessively clings to her tumultuous and volatile relationship with Julia while Viv is continuing an affair with a married man whom she seems unable to break free from. Viv's vulnerable young brother Duncan harbours a terrible secret, when a face from his past re-appears which threatens his fragile existence. Moving back in time through the Forties into the maelstrom of the Blitz, the lives, loves and