Drama series about a group of former Bletchley Park codebreakers. Now aware of the dark world she had got mixed up with and feeling responsible for the part she may have played, Millie takes the women to the heart of Marta's crime operation. The trail leads to a world of police corruption and cover-ups. With time against them and lives at stake, the women find themselves returning to codebreaking and Bletchley Park. With Rachael Stirling, Hattie Morahan, Sophie Rundle, Julie Graham, Brana Bajic, Edyta Budnik.
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