In the shadowy world of Cold War espionage, an undercover MI6 agent is found dead in Berlin on the cusp of the collapse of the Berlin Wall. He was in possession of a priceless dossier: a list of secret agents' identities, which holds great value to friend and foe alike. The British send their top spy, Lorraine Broughton, a lethal and enigmatic operative, to retrieve the confidential list at all costs. She arrives in a divided Berlin, a city of chaotic contrasts where the blare of revolution pulses against the remnants of a dark and oppressive era.

Upon arrival, Broughton partners with the station chief David Percival, a man who's gone native in the anarchy of Berlin. Percival's motives are unclear, and his methods are unorthodox, which gives Broughton pause as she navigates through a lethal game of spies. Complicating her mission, Broughton also seeks vengeance for the death of her fellow agent and discovers a web of intrigue that involves not just adversaries but potential double agents within her own ranks. Her skills in espionage are matched only by her ability to fight off anyone who stands in her way, using a blend of intelligence and physicality. Distrust pervades each alleyway and contact she encounters, forcing Broughton to rely on her own cunning and combat skills in the neon-lit, graffiti-strewn backdrop of a city on the brink of revolution.