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With the Russian mole inside MI-5 now in custody, the team tries to decipher the information Lucas North obtained in Moscow. It is apparent that the Russian intelligence service had their own equivalent to the British Sugar Horse network and have sleeper agents across Britain and throughout the various security agencies. Information from the mole indicates that a thermonuclear device will be exploded in central London and offers to reveal the identity of all sleeper agents in the UK if they agree to provide protection and a relocation package. The Russians have issued instructions to kill Harry Pearce and all of the members of Section D so getting to the mole's information will be difficult. Harry decides to meet his Russian counterpart to ensure he knows that they will all die if they don't work together to stop the bombing.

When two CIA agents are found dead, Ros puts herself in the firing line in order to expose the killer.

Roach is feeling the pressure and so turns to a new supplier known as The Viking. However, the Unit are already monitoring the terrifying and ruthless Viking. An old friend of Ash puts her life in danger trying to assist him.