Helen (Keira Knightley) is still betraying her nation’s secrets to the covert organisation she serves: the Black Doves. But after the misadventures of last Christmas, and with her husband Wallace (Andrew Buchan), preparing to become Prime Minister, she is walking a more treacherous line than ever.
As Helen’s enigmatic handler Mrs Reed (Sarah Lancashire) is ensnared in a ruthless plot to undermine her position in the Black Doves, Helen is reunited with her best friend Sam (Ben Whishaw). The once high-end triggerman is now reduced to lonely drinks in Soho bars and low-rate hits. As they search for answers, loyalties are weaponised, trust is shattered, and the fight to protect the people they love could cost everything. With all the explosive wit of Series 1, Helen and Sam’s mission leads them back to old friends and enemies, through the dark decisions and painful sacrifices of their pasts, and right to the heart of the Black Doves.