The original story for the film (outlined by DeWitt Bodeen) was to be about an orphaned heroine caught in a web of murder against a background of the Signal Hills oil wells. If she didn't find out the killer's identity in time, she would become his seventh victim. Producer Val Lewton wanted the story to go in a different direction and called in a second writer to help reshape it.
Erford Gage, who played the poet Jason Hoag, enlisted in the U.S. Army in August 1943 (around the time this film was released) and was killed in action in the Phillipines in March 1945.