American Barry Kohler calls Ezra Lieberman, a Nazi hunter in Austria, to report some unusual meetings between former Nazis living in Paraguay, but Lieberman is skeptical and tells him to leave the country. Later, at a meeting in the Paraguayan mansion of Herr Gunther, Dr. Joseph Mengele, a former SS physician at the Auschwitz extermination camp, conveys his plan to Capt. Mundt, Maj. Trausteiner, an officer from Dachau, Capt. Farnbach, a Gestapo agent, and three Neo-Nazis, Hessen, Kleist, and Schwimmer. Kohler listens to the discussion through a microphone he planted to record the meeting. When house security informs Mengele he is being watched, the men tear up the room until they find an electronic bug. After conversation stops, Kohler, in hiding on the mansion grounds, realizes that his device has been found and escapes, while Mengele learns Kohler’s identity from a servant boy. At his hotel, Kohler calls Lieberman, and relays Mengele’s plot, to kill ninety-four men who are sixty-five years of age over a two-and-a-half-year period. When Mengele and his men find Kohler, he is killed and his tape is destroyed. Even though Mengele suspects Lieberman may have heard something about Mengele’s plan, Mengele says the mission will continue. Meanwhile, the phone company in Paraguay tells Lieberman there is no record of Kohler’s call. Later, Lieberman’s sister, Esther, gives her brother envelopes that Kohler sent to their office, containing photographs of various officers of the Third Reich, many of whom were involved in the extermination of Jewish people. Lieberman admits to Esther that when Kohler’s phone went dead, he felt something evil. He asks Sydney Beynon, a Reuters reporter, to send him all news clippings from the Canadian, American and European bureaus, regarding the accidental deaths of sixty-five-year-old civil servants. At Mengele’s Paraguayan compound, Col. Eduard Seibert, head of project security, alerts Mengele that their plan is on schedule but wants to know why Mengele covered up Lieberman’s possible interference. Mengele insists that the timing of the killings is so critical that delays caused by Lieberman would cripple their project. Soon, Lieberman’s search takes him to nearby cities, based on clues found in the news clippings. He visits a German widow, Mrs. Doring, and learns that her dead husband beat their son, Erich, and verbally abused her. On Seibert’s second visit to Mengele, he alerts Mengele that Lieberman has talked to the wife of one of their victims. Mengele believes that Lieberman knows nothing and the visit was a coincidence, but Seibert suggests they exercise more caution. When Mengele says the solution is to kill Lieberman, Seibert argues that his death would arouse suspicion around the world. Mengele makes it clear that Lieberman is Seibert’s problem. When Esther meets her brother at the train station, David Bennett, Kohler’s friend, shows them Kohler’s letters and photographs, but Lieberman says he works alone. However, Bennett won’t leave until he joins Lieberman’s investigation. Esther says that Bennett can sort through a big pile of Reuter’s news clippings. When Lieberman visits Mrs. Curry, an American widow, her son, Jack Curry, strolls into the kitchen and Lieberman notices the striking resemblance of the boy to the German widow’s son. During their investigation, Bennett describes seeing Simon Harrington, another dark-haired, blue-eyed and pale-skinned boy at one of the homes he visits. Later, Mrs. Curry informs Lieberman that she and her husband adopted their son from a German woman, Frieda Maloney. When Lieberman visits the West German prison where Maloney is incarcerated, Maloney explains that her work for an adoption agency involved placing dark-haired, blue-eyed boys with families of Nordic-Christian backgrounds with civil servant fathers born between 1910 and 1914 and younger wives born between 1933 and 1937. She claims to know nothing about Mengele’s role in the adoptions and refuses to answer any more questions. After her lawyer calms her down, Maloney answers one last question about her dog Schatzi, which gives Lieberman the clue to his next interview at the Wheelock dog-breeding farm in Pennsylvania. Lieberman begins to see a pattern between the dates of the adoptions, the sons all of the same age, and the fathers targeted for assassination. Later, Seibert informs Mengele that the mission has been terminated because Lieberman visited Maloney. However, with eighteen killings completed by the recalled assassins, it would be possible to have one or two successes according to the doctor’s projections; Seibert repeats that the operation has been terminated, but Mengele ignores him. When Lieberman pays a visit to Professor Bruckner at the Institute of Biology, he tells Bruckner that the boys he saw had the same personality even though they spoke different languages. The scientist answers that twins that are raised separately develop distinct personalities, and it would be impossible for them to be the same unless they were cloned. The professor gives Lieberman a crash course on cloning, adding that in addition to cell duplication, environmental factors would have to be duplicated between subjects to develop the same personality. Next, Lieberman asks if the donor has to be alive for clones to be created. When he learns a donor can be dead, a pained look washes across Lieberman’s face as he realizes Mengele’s plan involves unleashing Adolph Hitler’s clone onto the world. Later, Mengele journeys to the Wheelock Farm in Lancaster, Pennsylvania, where owner Henry Wheelock mistakes him for Lieberman and invites him inside the house. Mengele is nervous around the Dobermans and asks Wheelock to lock them up when he learns that the dogs will attack anyone who hurts Wheelock. Once the threat of the dogs is gone, Mengele shoots Wheelock dead in the basement. Afterward, Lieberman wanders inside Wheelock’s house, calling out his name. He strolls cautiously into the living room and Mengele shoots him. Lieberman grabs Mengeles and they wrestle on the ground. Mengele breaks free and points his gun at Lieberman, explaining that Hitler was thrilled that his genetic copy could be recreated in the future, from a liter of his blood and tissue from his ribs. While Mengeles shoots at him, Lieberman leaps up and frees the Dobermans. The dogs surround Mengele and he drops his gun in a panic. Bobby Wheelock arrives home from school, and photographs the bloody faces of Mengele and Lieberman with his camera. Mengele tries to blame the fight on Lieberman but Bobby knows the dogs are trained to respond to a threat. When Bobby calls the police, Mengele boasts that Bobby has the potential to be great, descended from Adolph Hitler, the greatest man in history. Bobby’s response is to tell Mengele he is weird. He then finds his father dead in the basement and orders the dogs to kill Mengele. Afterward, Bobby agrees to call an ambulance for Lieberman if he remains silent about Mengele’s dog-provoked death. When Bennett visits Lieberman in the hospital, he says that Mengele may be dead, but the job isn’t done until the ninety-four boys are killed. Lieberman decides he won’t be responsible for the slaughter of innocent children and burns up Mengele’s clone list with his cigarette lighter.