This was the only movie produced by "Charlemagne Films," which was created by Sir Christopher Lee and Anthony Nelson Keys.
Sir Christopher Lee and Charlemagne Films optioned two other books by John Blackburn, "Portrait of Barbara" and "Bury Him Darkly", which were envisioned as sequels to this movie, with Lee re-creating the role of Colonel Bingham, but it didn't work out. They also optioned some of Dennis Wheatley's books, but only "To the Devil a Daughter" was ultimately made, and by Hammer, not Charlemagne.
The Fox-Rank distributors tried to publicize this movie by offering cash prizes for letters from readers of the Sunday Mercury describing their real-life experiences with terror and the supernatural.
John Blackburn, who wrote the novel on which this movie was based, was displeased with casting of Diana Dors, feeling she was miscast.
In his autobiography, Sir Christopher Lee explains that while shooting this film, Lee and his friend Peter Cushing were playing golf in Thurlsdom. An angry man passing by accused them of trespassing and explained he would report them to the landlord. Lee and Cushing explained they would talk to the landlord to explain their activities before asking the landlord's name. The man replied, "His name is Charles." After Lee insisted on his last name, the man exclaimed, "Prince Charles."