Warner Bros. had plans for a sequel to this film and a possible series (along the likes of MGM's very successful L'uomo ombra (1934) pictures) in mind. However, with the lukewarm reception this film received, those plans were abandoned.
Errol Flynn had just made seven period pictures in a row and was lobbying Jack L. Warner for a change, and he was cast when this role became available.
The original play called "Katzenzungen" was written by Ladislas Fodor using the pseudonym W. George Selous. It was adapted into English by Bernard Merivale, with additional dialogue by Jeffrey Dell, and produced in London under the title "Blondie White".
As soon as Errol Flynn was announced for this film, an article in the September 21, 1940 Los Angeles Times reported that his frequent co-star Olivia de Havilland would be in this film as well, but the role ended up going to Brenda Marshall.
According to an article in the June 12, 1940 edition of The Hollywood Reporter, Edward G. Robinson was to star in this film, but he would go on to make Il lupo dei mari (1941) instead.