Kate runs Cyclops in an audacious mission inside Moscow Secret Service HQ to finally trap the MI6 mole.

The pressure mounts on Kate when the Russians target her family, and Rav follows clues to Geneva.

Kate's bold rescue mission in Malta backfires and she draws flak from all sides.

Kate suspects that her agent is in danger and, defying orders, prepares to rescue her.

An MI6 agent learns that there is a Russian asset in the UK Cabinet.