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As Danny deals with the fallout from the Russian cyber-attack, a bold new threat emerges.

Vadim finds himself working for the Chinese. Danny and Roz clash, and the mole hunt is on.

Barbara faces an impossible decision when her charming ex-boyfriend Nicky Chan re-appears.

A malware attack on British government departments forces Danny and Roz to work together.

Charlie interrogates Barbara, and Danny discovers a clue that turns his life upside down.

Danny puts everything on the line in order to right some wrongs.