Dr. Ivo Tasca, a chemist, is murdered by a letter bomb sent to his research laboratory before he can expose his former employer, Stegner Enterprises, for manufacturing cancer-causing pharmaceuticals. However, his widow, Adele Tasca, retrieves the incriminating evidence from a hidden location and delivers it to Mr. Hull at the U.S. Department of Justice in Washington, D.C. Since Karl Stegner, the head of the global conglomerate, is the primary suspect in her husband’s death, Adele is eager to know when the government will take action against him. Mr. Hull informs her that they already have a lengthy case against Stegner, involving bribery, fraud and tax evasion, but the reclusive tycoon has been living abroad for several years in countries that refuse to extradite him. As the third-richest man in the world, he can afford luxurious and secure hideouts. Adele recommends the services of independent contractor, Jerry Fanon, whom Hull has hired as a bounty hunter in the past. With the help of organized crime boss, Sal Hyman, Hull lures Jerry out of retirement to capture Stegner for a $1 million reward. During the briefing with the Justice Department, Jerry is informed that Stegner has been living on the Caribbean island of Antigua for three years, but the identity of the illusive multi-millionaire, who has always avoided being photographed, is unknown. Jerry is shown pictures of Stegner’s entourage, including security chief Leo Gelhorn, and personal physician, Dr. Charles Felix, who is always nearby because of Stegner’s heart condition. While preparing for the assignment, Jerry enlists Catlett, a professional burglar, to assist him. After arriving in Antigua, Jerry and Catlett infiltrate and set fire to Stegner’s estate, but fail to confirm the whereabouts of Stegner or Dr. Felix. Meanwhile, Adele also travels to Antigua at the invitation of Stegner Enterprises. As explained by Gelhorn, the company wants to offer her protection from the mafia, whom they believe are responsible for killing her husband. Although skeptical of their intentions, she remains on the island and appears to accept the offer of sanctuary. At her hotel, Adele reunites with Jerry, an ex-lover whom she has not seen in twelve years. She wants to assist him with Stegner’s capture, but she does not reveal that she is in communication with Stegner’s associates. Later, Jerry tortures one of Stegner’s bodyguards and learns that the tycoon has relocated to the island of Curaçao. Upon arrival, Jerry relies on help from a well-connected acquaintance named Dominic Carbone, who provides his house as a base of operations for Jerry, Catlett and Adele. Carbone informs them that the Stegner office suite is located on the top floor of the Plaza Hotel and provides a map of a nearby plantation owned by Dr. Felix. The following day, Jerry and Catlett abduct Dr. Felix, escort him at gunpoint to the heavily guarded hotel suite and overpower Stegner’s entourage. After Jerry forces Gelhorn to unlock Stegner’s room, he and Catlett leave with the tycoon and escape on a motorboat with Adele. As Jerry navigates to a cove, where Carbone’s seaplane is waiting, Gelhorn arrives by helicopter and attempts to stop them. With Stegner on board, Jerry takes off in the seaplane bound for Miami, Florida, but is forced to leave Adele and Catlett behind. In a fierce gunfight, Gelhorn shoots Catlett dead. As the duplicitous Adele readily joins Gelhorn in the helicopter, she asks if the killing was really necessary. After delivering Stegner to the authorities in Miami, Jerry plans to return to retirement, until a group of unknown men ambush the government motorcade transporting Stegner and assassinate the tycoon. Hull concludes that an organized crime syndicate is responsible, but Jerry suspects that the man he captured in Curaçao was not Stegner. When the autopsy confirms that the dead “Stegner” did not have a heart condition, Jerry pilots the seaplane back to Curaçao to find the real tycoon and finish the job. Meanwhile, at the plantation in Curaçao, Adele has become the mistress of the real Stegner, who has been posing all along as Dr. Felix. When Jerry sneaks on the property, he rigs bombs underneath the cars and immobilizes two of the security guards. After charging through the house on a bulldozer, Jerry seizes Stegner and escapes with the tycoon in a jeep, driven by Adele, who gives no indication of her allegiance to Stegner. Gelhorn’s guards pursue, but their cars explode during the chase. As Jerry, Adele and Stegner make it safely to the seaplane dock, Jerry gives his gun to Adele so that she can keep the tycoon in check while he prepares the aircraft. To Jerry’s surprise, Adele hands over the weapon to her current lover, Stegner. However, when the tycoon aims to shoot Jerry, Adele has second thoughts and switches loyalties once again, knocking the gun out of Stegner’s hands. Jerry cautions Adele that she “changes sides too often.” Defying a final attempt by Gelhorn to stop him, Jerry flies off in the seaplane with Adele and Stegner on board, and successfully delivers the real tycoon to the U.S. government. Sometime later, Adele attends a society party where she sets her sights on another multi-millionaire, Harold Everett, the world’s fourth-richest man.