During the Cold War, a highly decorated Russian official and his family defect from the Soviet Union to America. Upon his defection, he is interrogated by United States government agent, Michael Nordstrom (John Forsythe) and it is revealed that a mysterious French intelligence group known as “Topaz” has been leaking NATO secrets to the Soviets, and may have ignited the 1962 Cuban Missile Crisis. Nordstrom must rely on his wits and French counterpart, Andre Devereaux (Frederick Stafford) if he is to discover the true nature of Topaz and thwart them in time to protect U. S. secrets during the Cold War. Devereaux must himself see through the group secret identity if he is to protect the integrity of his country’s intelligence.