Philip and Elizabeth Jennings seem like your average American couple. Married for nearly 20 years they have two children, run a travel agency and live in suburbia. However, they are masking a secret double-life: they are, in fact, Russian spies, planted in the US nearly 20 years previously. It is the early-1980s and the height of the Cold War, with Philip and Elizabeth at the forefront of the USSR's attempts to gain information on US activities and weaponry. Tasked with countering espionage and tracking down Soviet spies is a special division of the FBI. Stan Beeman is one of their brightest agents. He also happens to be the Jennings's neighbour.