Pack of Lies is a 1983 play by English writer Hugh Whitemore, itself adapted from his Act of Betrayal, an episode of the BBC anthology series Play of the Month transmitted in 1971.
The Jacksons, a seemingly ordinary middle-aged English couple, share a close friendship with their Canadian neighbours, the Krogers. All appears blissful until a detective from Scotland Yard approaches them. The detective requests to use their house as an observation station to thwart a Soviet spy ring operating in the area during the autumn and winter of 1960-1961. Loyalty, duty, and friendship collide as the Jacksons slowly discover that the Krogers, their cherished friends, are not what they appear.