In
Copenhagen in 1962, a high-ranking
Soviet intelligence officer, Boris Kusenov, defects to the West. During debriefing,
CIA agent Mike Nordstrom learns that Soviet missiles with nuclear warheads will be placed in Cuba. Needing physical evidence, Nordstrom discloses Kusenov's name to French agent André Devereaux and asks him to bribe Luis Uribe, a member of Cuba's UN delegation, to provide photographs of documents that confirm the missile bases in Cuba. Devereaux decides to accompany his daughter, Michèle, on her honeymoon to
New York City with his son-in-law, François Picard. André's wife Nicole is worried that André is using the family trip to work for Nordstrom in New York. In New York City, French agent Philippe Dubois is to contact Uribe, who is the secretary to Cuban official Rico Parra, who is staying at the
Hotel Theresa in
Harlem to show solidarity with the black community. Dubois sneaks into the hotel and bribes Uribe to take the documents from Parra's office to photograph. Parra catches Dubois photographing the documents. Chased and shot at by Cuban revolutionaries, Dubois purposefully knocks into Devereaux, who is watching events from the other side of the street, and slips him the camera. A red-headed Cuban guard helps Devereaux to get up but lets him go. Dubois escapes into the crowd around the hotel. Dubois's photos confirm that the Soviets are placing missiles in Cuba. Devereaux, despite accusations of infidelity by his wife Nicole, flies to Cuba. His mistress, Juanita de Cordoba (
Karin Dor), was the widow of a "hero of the Revolution," which enables her to work undercover in the resistance. Upon his arrival, Devereaux finds Parra, another of her lovers, leaving Juanita's mansion. Devereaux asks Juanita to take photographs of the missiles. Juanita's loyal domestic staff, Carlotta and Pablo Mendoza, pose as picnickers and photograph the missiles. Pursued, the two hide the incriminating film before they are captured. During a mass rally and a lengthy speech by the
líder máximo, the red-headed Cuban guard recognises Devereaux's face from the New York City incident. Parra has heard from the tortured Carlotta Mendoza that Juanita is their leader. He embraces her and shoots her dead to save her from extreme torture. At the
Havana airport, the Cuban authorities fail to find the microfilms that Deveraux has. He returns to find that Nicole has left him. Devereaux is recalled to Paris. Before he leaves, Kusenov tells him about the existence of a Soviet spy organisation, "Topaz," within the
French intelligence service. He is given the name of
NATO official Henri Jarré, who leaked documents to the
KGB. In Paris, André is picked up at the airport by Michèle and François. He accompanies Michèle to a cocktail party at his friend Jacques Granville's house. Michèle wants to reconcile her parents, as Nicole has found out about André's affair with Juanita. When Michèle asks her mother to help her father, she refuses. At the party, Jacques confesses to a friend that he once liked Nicole, but that she married André. André invites some of his old friends and colleagues, including Granville and Jarré, to a lunch at a fine Paris restaurant under the pretext of helping Devereaux prepare for his inquiry. Devereaux tells the others about Topaz to provoke some reaction. Jarré claims that it is misinformation and that Kusenov died a year ago. Jarré panics and visits the leader of the spy ring, Jacques Granville. Devereaux, Nicole, and Granville were close friends from their days together during the
French Resistance. Granville tells Jarré that it was a mistake to say Kusenov was dead since the Americans will easily discover that Jarré lied. As Jarré leaves Granville's house, Nicole arrives to meet Granville, who is her lover. She glimpses Jarré departing. Devereaux sends his son-in-law, François, to interview Jarré and coax him into admitting something. Before François can succeed, two mysterious men show up. Devereaux and Michèle rush to Jarré's flat and find Jarré dead, a staged suicide, and François missing. François returns to Michèle's apartment and says he was clubbed and kidnapped, but managed to escape from his captors' car, after overhearing the phone number of their boss, known as Columbine, the head of Topaz. Nicole recognizes François's sketch of Jarré as the man she saw leaving Granville's house, and recognizes the phone number as Granville's. She tearfully tells her family that Granville must be the leader of Topaz. Granville, exposed, commits suicide (in the American and the French versions) or flees to the Soviet Union (in the British version). ==Cast==