powered by AFI
A written acknowledgment in the opening credits reads: "This picture was produced in Lisbon, Portugal by the Republic Studio Organization." Ray Milland's onscreen credits appeared as "R. A. Milland" and "R. Milland" for associate producer and director respectively, and "Ray Milland" at the head of the cast list. An October 1951 Daily Variety news item reported that Martin Rackin's original story was previously bought by Paramount for Irving Asher to produce, and a February 1953 Daily Variety news item announced that Joan Crawford was signed to star in the film.
By June 1955, Milland, while preparing to produce the film for Republic, was negotiating for Mary Murphy to play a lead role, according to a Los Angeles Times news item. An October 1955 Hollywood Reporter news item reported plans to shoot the film in the Cinepanorama process. According to all reviews, the film was shot entirely in Lisbon, and as noted in an April 1956 ^LAT article, Lisbon was the first "Hollywood" film shot entirely in Portugal. That article and also a September 1956 American Cinematographer article describe the difficulties the crew had in filming in an area providing only outmoded film equipment and untrained personnel. According to the American Cinematographer article, portions of the film were shot at various Lisbon locations, including the Castle of Pina, the Cathedral, the Cintra Restaurant and the mansion of banker Esperito Santos.