On Christmas Eve in 1944, SS-Obersturmbannführer Adolf Eichmann (Kingsley) flees the Eastern Front to Berlin to coordinate the destruction of documents related to Department B4, going into hiding after the war ends. In Buenos Aires, Sylvia Hermann (Haley Lu Richardson) begins courting Klaus Eichmann (Joe Alwyn). Klaus meets Sylvia and her German-Jewish father, Lothar (Peter Strauss) at home. Klaus speaks of his father's service with the SS but tells Lothar that he had died on the Eastern Front, and that he has been raised by his uncle, Ricardo. Suspicious, Lothar passes this information to West German prosecutor-general Fritz Bauer. Bauer, suspecting Klaus' uncle may in fact be Adolf Eichmann, relays this intelligence to Mossad director Isser Harel (Lior Raz) in Tel Aviv, but Harel is unwilling to devote resources to investigate. At the insistence of Rafi Eitan (Nick Kroll), Harel dispatches field agent Zvi Aharoni (Michael Aronov) to Buenos Aries to begin reconnaissance. At a dinner party celebrating Argentina's 150th anniversary of independence from Spain, Klaus introduces Sylvia to Carlos Fuldner, a former Nazi officer who assisted with SS members escape to Argentina. Fuldner addresses the guests with anti-Semitic rhetoric invoking the Hitlergrüsse, leaving Sylvia visibly disturbed, who promptly leaves..