James Bond fights diamond smugglers and blackmailers in Las Vegas.

Searching the globe for his notorious archenemy Ernst Stavros Blofeld, British espionage agent James Bond discovers him at a secret laboratory where Blofeld is developing "plastic transformation" to make doubles of himself. Bond attacks and kills Blofeld and several henchmen, then returns to London. There, intelligence chief "M" assigns Bond to discover who is behind the theft and stockpiling of a vast supply of South African diamonds. With intelligence that thief Peter Franks will be serving as a courier for the latest shipment of stolen diamonds, M5 arrests Franks and Bond assumes his identity to travel to Amsterdam to meet Franks's contact, American Tiffany Case. Unknown to Bond, hit men Wint and Kidd, who have transported the latest diamond supply from South Africa to Holland, have lost the shipment to informant Mrs. Whistler who, after delivering the diamonds to Tiffany, is murdered by the henchmen. Later, Bond learns that Franks has escaped and intercepts him in Tiffany's apartment building. After a furious fight in the tiny building's lift, Bond kills Franks and tells Tiffany the dead man is James Bond. Tiffany informs Bond that he is to smuggle the diamonds to Los Angeles hidden in Franks's casket. Upon landing in Los Angeles, Bond is welcomed by longtime friend and CIA operative Feliz Leiter, disguised as a customs agent. Still in the guise of Franks, Bond and the casket are picked up by the Slumber, Inc. funeral home hearse and driven to Nevada. At the desert chapel run by Morton Slumber, the real Franks is cremated and the diamonds passed to Bond, who is knocked out by Wint and Kidd, then placed in a casket that is sent through the crematory. Bond is rescued from incineration by lounge entertainer and smuggler Shady Tree, who states that the urn was full of paste stones and demands to know the location of the real diamonds. Bond vows to provide the gems and agrees to meet Shady that night at the Whyte House Hotel, where the comedian performs. That evening, Burt Saxby, Whyte House casino floor manager and associate of reclusive millionaire and hotel owner Willard Whyte, fails to intercept Wint and Kidd before they kill Shady in search of the diamonds. After a successful game of craps, assisted by pretty Plenty O'Toole, Bond takes the girl to his hotel room, where they are confronted by Slumber's hoodlums who throw Plenty out of the window into the pool several stories below. Bond is puzzled by the hoodlum's abrupt retreat, then finds Tiffany waiting for him in the bedroom. Tiffany suggests they sell the diamonds in Hong Kong and split the profits. Suspecting that Tiffany is connected to the diamond hoarder, Bond arranges with Leiter to pass the gems to her at the Circus Circus casino. Although the casino is covered by several American agents, Tiffany escapes with the stuffed animal containing the diamonds. Bond catches up with Tiffany at her house in the desert, but when they find Plenty, who was mistaken for Tiffany, dead in the pool, Tiffany agrees to help retrieve the stones. The couple follows a courier with the stuffed animal from an airport locker to Saxby who hands the toy off to a man in a van. Hiding onboard the van, Bond is taken to Whyte Techtronics lab, where the driver, light retraction expert Dr. Metz, takes the diamonds to a laboratory where a satellite dish is under construction. Discovered in the lab, Bond escapes company security using a test moon rover and, later, Tiffany's sporty Mach 1 Mustang coupe. Taking a lavish room in the Whyte House with Tiffany, Bond disregards Leiter's instructions to leave Whyte alone and breaks into his penthouse only to find Blofeld and his identical double. Both Blofelds reveal that Whyte has long served as a cover for the diamond smuggling because of the millionaire's widespread interests in technology and oil. Bond distinguishes the Blofeld double and kills him, but the real Blofeld has the agent gassed and taken by Wint and Kidd to the desert where he is buried in a large pipe. Reviving, Bond short-circuits the robotic pipe security, which summons a repair team who inadvertently rescue the agent. Back at the hotel, using a gimmick rigged up by British intelligence inventor "Q," Bond phones Blofeld and, impersonating Saxby, tricks him into revealing Whyte's location at his summer home outside of town. Bond, Leiter and several agents go to the house and after Bond cools off the gymnastic guards, Bambi and Thumper, by wrestling them in the pool, the agents locate Whyte locked in one portion of the house. Saxby attempts to intervene as Bond and Leiter free Whyte, but is killed by the agents. Back at the hotel, Tiffany spots Blofeld disguised as a woman and follows him to his car where he forces her to accompany him. At Whyte's penthouse, the millionaire discovers that Blofeld has used his identity and businesses to construct a satellite that has just launched. Despite attempts by the American government to prevent it, the satellite deploys a dish constructed of solid diamonds that concentrates the rays of the sun into a powerful laser beam that subsequently destroys an American missile, a Russian submarine and a Chinese missile launch pad. Whyte learns from Washington contacts that, using the threat of the satellite laser, Blofeld is holding America hostage. When Bond asks how the satellite is controlled, Whyte explains it is programmed by a simple coded cassette tape. Discovering that Blofeld has developed an oil rig off the coast of Baja, Bond concludes the tower serves as the satellite control and skydives there. Bond finds Tiffany, but is quickly subdued by Blofeld's guards. Taken to Blofeld, who is about to destroy Washington, D.C., Bond spots a cassette and signals Tiffany, who surreptitiously slips it to him. In the control room, Bond manages to exchange the music tape for the coded tape and places it in Tiffany's bikini bottom. Confusing the tapes, Tiffany replaces the coded tape in the control room and the ten-minute countdown to destroy Washington begins. Outside, Bond signals Leiter and the agents waiting in helicopters and they make a furious attack on the oil rig. Bond evades his guards and spotting Blofeld attempting to escape in a mini submarine being lowered by a crane, overpowers the crane driver and swings the sub into the control room, smashing it. With the mission completed, Bond and Tiffany relax on a cruise on one of Whyte's ships, but are attacked by Wint and Kidd disguised as waiters. After Bond kills the duo, Tiffany wonders how they can retrieve the diamonds in the satellite dish.