Alicia Huberman (Ingrid Bergman), daughter of a Nazi spy convicted of treason against the US, meets a dashing stranger named Devlin (Cary Grant). It turns out Devlin works for the intelligence community and he wants to recruit her to infiltrate a cadre of Nazis living in Brazil. Despite the fact that Alicia and Devlin have fallen in love, Alicia realizes the only way to discover what the Nazis are plotting is to marry into the inner circle – a man who has been unsuccessfully courting her for years, Alexander Sebastian (Claude Rains).