I wanted Lizabeth Scott. I didn't want some blonde with big tits. You had to believe that this girl was real. Even if I took one of these over-sexed types who could not act, it would change how the Powell character is drawn into the affair. Remember the point of the script was that he's just a middle-level insurance investigator. He's tired of his job, spending time in his little office with a drab secretary. So I could have made a different picture, with a prettier girl than Lizabeth Scott, and told the story of that girl, her problems, but that wasn't this movie. That would make it phony, if you cast it with Marilyn Monroe, a type like that. I needed somebody real.