Based on the true story of the Krogers, convicted in 1961 of spying for the Russians, this is a fictional account of the quiet, totally unsuspecting Jackson family who live opposite the Krogers and consider them their closest friends. When an MI5 official arrives suddenly to use the Jacksons' house as a surveillance post their decent, happy life is shattered as they are plunged into a sordid, alien world of deceit and intrigue.