 Working titles for the film, which began production on March 18, 1940 and initially finished on June 5, were "Personal History" and "Imposter".Shooting took place at the Samuel Goldwyn Studio in West Hollywood, and on location around Los Angeles and Long Beach.After the film wrapped, Hitchcock visited his native England, and returned on July 3, to report that it was expected there that the Germans would begin bombing London at any time.