Season 4, Episode 10: Season Finale
On the eve of her stepbrother Peter's suicide, Ruth is visited by his partner Angela, an ex-MI5 officer famous for her operational accomplishments. Angela asks Ruth for help in procuring evidence that proves MI5, and more specifically Harry, assassinated Lady Diana -- the news of which ultimately brought about Peter's suicide. Ruth dismisses the idea, but the following day Angela walks onto the Grid carrying a bomb big enough to explode the whole of Thames House. Angela forces the team to find evidence that MI5 killed Diana. The team searches through the night, building a story based on facts and conspiracy theories. It begins to look as though there might be truth to the claim, until Harry disproves it. Ruth finally gets through to Angela by constructing a "truth" about her relationship with Peter. The team agrees to award Angela "victim in the field" status and allow her to walk free, but as she disappears Ruth notices the Buckingham Palace security plans have gone missing. Forces are mobilised and the Royal Family evacuated to a bunker when Adam realises they are playing into Angela's hands yet again - the bomb is in the bunker. They manage to dispose of the bomb and the Royal family is safe. Thwarted and furious, Angela seeks to take her revenge on Harry and Adam in a terrifying way.
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