Episode 1

S10, E1: Ghosts from the past come back to haunt MI5 chief Harry Pearce, prompting a shocking revelation about his time as a spy during the Cold War. Harry survives his MI5 employment tribunal and is quickly back on the Grid, where changes have been made to the team. Buried secrets are unearthed when Max Witt, a retired spy and Harry's colleague in Berlin during the Cold War, is found murdered by an unknown assassin.