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The penultimate season of the hugely successful, long-running drama introduces a host of new characters. There's Beth Bailey, a brilliant ex-mercenary who was posing as an Eastern European prostitute when she ran into the team. Dimitri, an ex officer in British Special Forces, has been recruited for his skills in fighting terrorism on the front line. And finally, data analyst Tariq has been fast-tracked through the system.

Lionel and Jean were lovers many years ago at the time of the Korean War. They were separated by a misunderstanding. Forty years later, fate brings them together again with hilarious results.

Catherine Morland is a young woman addicted to Gothic romance novels. Her family sends her to Bath, and in its society of decadence and deceit, she makes the acquaintance of romantic Henry Tilney and his family. When she is invited to his ancestral home, Northanger Abbey, a mystery unfolds, and she wonders if the fantasies inspired by the novels she loves are coming true.

A mysterious new clone appears this season, linking the current season to the past. Felix is having feelings of separation and loss because of the big revelation that Sarah is actually related to S, while Felix isn't.