Notorious (1946)

After her Nazi father is convicted of treason, Alicia is asked to gather information on a ring of Nazi scientists in South America. She agrees to the mission and goes to Rio de Janeiro, where she encounters her former suitor, Alexander Sebastian. Alicia marries Alexander as part of her mission, but their relationship becomes strained as she falls in love with her partner, Devlin. Eventually, Alicia and Devlin discover that Alexander is manufacturing uranium and working on a war machine. Alicia grows sick from poison, but with Devlin's help, they rescue her and reveal Alexander's true intentions to the group.