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Ros is talking to double agents Yalta about an operation they are planning against the US when she’s seen by reporter Ben Kaplan and the CIA’s Bob Hogan. Afraid that her links with Yalta will be revealed, Ros tells Harry and Adam that the only way to stop Yalta is to find out exactly what the operation involves.

Yalta have asked Ros to find the activation code they need for their plan, and while Ros and Adam head for Yalta headquarters, Jo, Malcolm, Connie and Ben work hard to get it to her in time. But when Yalta begin to suspect Ros of double-crossing them, they order her to tell them where Harry is…

As Harry is brought to meet Yalta’s chief, whose identity shocks him, they reveal the horrific details of their plot, Operation Floodland. Adam and Ros manage to flee Yalta HQ and head back to the Grid where they hope that Malcolm can stop Operation Floodland.

But when Ros decides to turn back to save Harry, she’s caught and, in a terrifying showdown, is given a lethal injection by the Yalta chief…

VIDEO: Watch a preview of Spooks