Frank checks into a nightmare treatment centre, which KORPS' has infiltrated in order to steal secrets directly from the brains of MI9 agents. With the threat of nuclear destruction looming, the team are faced with their most difficult dilemma yet - to save Frank's life or to rescue Britain from catastrophe. Will they choose the greater good over the well being of their beloved spy handler?

Briefed to protect Grand Duke Nicholas, the heir to the throne of a small European state. The team hide him in St Heart's, where the arrogant prince must learn to behave as a commoner with hilarious consequences. Can the team protect this spoilt royal who refuses to submit to authority?