powered by AFI
The working titles of this film were The Raven, The Last Letter, The Scarlet Pen, and Poison Pen. According to the onscreen credits, the picture "was photographed in its entirety in a small French-Canadian community in the Province of Quebec." An October 1950 Hollywood Reporter news item indicates that some filming was done in Hollywood, CA, however. According to a July 1950 Hollywood Reporter news item, Maureen O'Hara and Joseph Cotten were originally set to co-star in the film with Linda Darnell. The 13th Letter marked the screen debuts of Judith Evelyn and Guy Sorel. According to a modern source, Le Corbeau, the French film on which The 13th Letter was based, was inspired by a real-life, pre-World War II incident involving poison pen letters in Tulle, France. Le Corbeau was directed by Henri-Georges Clouzot and starred Pierre Fresnay and Pierre Larquey. Clouzot also co-wrote the film's adaptation and dialogue with Louis Chavance, although only Chavance is credited as the story writer in the onscreen credits of The 13th Letter.