Amid the chaos of D-Day, alarming wireless messages revealed Special Operations Executive (SOE) disloyalty. While concerns escalated, Allied troops advanced and Paris was liberated. SOE operations subsequently dwindled, prompting Second World War spymistress Vera Atkins to confront the harm done to her agents.

Assigned to the British War Crime Investigation Unit in post-war Germany, British intelligence officer Vera Atkins pursued her agents' fate at Natzweiler and Ravensbrück. Piecing together testimonies, she insisted on obtaining official records to substantiate her findings for upcoming trials. While Vera sought justice for her girls, a letter challenged her verdicts on Noor's fate. Suspicions of double agents led Vera to hunt down a Nazi mastermind. She was still to determine whether any agents had escapeed, and if not who had betrayed them.