MI5 agent Beatrice Ogilvie is warned of an impending terrorist attack. Beatrice suspects that the Danish Secret Service agent Katrine Poulsen is involved and set a trap for her.

Beatrice is assigned to lead a security group for the Prime Minister, when he will meet a young woman. Has Beatrice been asked to enable an infidelity deal?

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Beatrice's father is arrested on suspicion of being the Russian mole. Beatrice swears to prove his innocence.

Beatrice competes against the clock to save the life of GRU resource Yelena Alekin. Torben Jensen, Katrine's missing boyfriend, is finally found.

Beatrice now knows that Katrine is part of Redback. She confronts her, but Katrine has information that makes Beatrice astonish.

Shock when the Prime Minister finally loses the referendum. Beatrice tells William that she knows he was behind the Skanda bomb.

Operation Redback ends when a nuclear meltdown allows Russia to carry out a "friendly invasion" of Scotland.