Plot: A highly ranked Russian official, Boris Kusenov, his wife and daughter defect to America. Hoped to be a boon for their efforts battling the Cold War with Russia, the Americans soon find out that they have more to deal with than first thought, with Kusenov being less than cooperative, especially in regards to anything to do with a known leak in the French government, codenamed "Topaz", which has seen top secret files leaked to those in Moscow. On discovering an agreement between the Russians and Cubans, agent Nordstrom enlists the aid of his friend, and French Intelligence Agent, André Devereaux, who, at this time, is accompanying his daughter Michele on her honeymoon with journalist Francois Picard. André accepts, but his wife Nicole is worried for him. After managing to get ahold of some seriously damning papers from the visiting Cuban official Rico Parra, sneakily of course, a concerned Devereaux jets off to Cuba and catches up with his mistress Juanita de Cordoba, who is now secretly involved with a local underground movement while also being involved in another way with Parra. He finds out and kills Juanita. Ever the jet setter, Devereaux is now off home to Paris to get to the bottom of this whole leak problem. Michele wants to reconcile her parents. Nicole cheats André after his Cuban affair with the leader of the spy-ring "Topaz", Jacques Granville. Francois goes on, to find out, who is "Topaz", and he interrogates N.A.T.O. official Henri Jarre. A short time later, Michèle finds the murdered Jarré, and Francois is missing.
Alternative Plot: When a Soviet official defects to the United States, he brings with him claims that Russia is using Cuba as a staging ground for nuclear missiles. CIA agent Michael Nordstrom (John Forsythe) enlists the help of French spy Andr
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