In 1946 Miami, Alicia Huberman (Ingrid Bergman) is a woman who likes partying and drinking and is rather casual about sexual relationships. Soon she is recruited by T.R. "Dev" Devlin, a U.S. intelligence agent, to infiltrate and spy on a group of Nazis in Rio de Janeiro. Alicia and Dev become romantically involved, but in the course of her work she becomes sexually involved with a Nazi leader (Claude Rains) and then goes on to marry him. Alicia and Dev uncover a Nazi scheme that poses a serious threat, but they grow increasingly troubled by the conflict between their love for each other and the work they are doing. Eventually, with Alicias life in danger and time running out, Dev is forced to come to terms with their relationship as he embarks on a perilous course of action. Alfred Hitchcock masterfully builds the suspense in what is arguably his greatest visual achievement.