Alicia Huberman (Ingrid Bergman) watches as her father is sent to prison for spying. Intending to drown her difficulties in alcohol, she is attracted instead to a mysterious CIA agent T. R. Devlin (Cary Grant). He recruits her to become a spy against the very Nazi organization in Brazil that her father was associated with. Because of her connections, she gets into the Nazi circle quickly and is romanced by Alexander Sebastian (Claude Rains). Alicia is convinced that Devlin thinks she is a tramp and an alcoholic, so she throws herself at Sebastian to get his attention. But Devlin does not protest and she is caught up in getting married to a Nazi. Devlin must realize that he is in love with Alicia to rescue her from this marriage before the Nazis discover she is a spy and kill her.