The first episode of an action-packed and thrilling adaptation of ITV News journalist Tom Bradby's 2019 novel. An MI6 agent learns that there is a Russian asset in the UK Cabinet.

Kate suspects that her agent is in danger and, defying orders, prepares to rescue her. Later, she uncovers the Prime Ministerial candidates' murky Russian connections.

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

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

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