Yuri Yevgenev, a Russian secret agent, lands up in the local police station after being set up by Maggie and the Special Branch boys. In the ensuing KGB attempts to have Yuri returned, Maggie's life is threatened, and Tessa and Fred discover that a Home Office secretary supplied information leading to Maggie's capture.
Fred and Tessa effect a dramatic rescue and save Maggie from impending torture.
