Unfortunately I can't comment on the movie as I have never seen it, but I just thought I'd let people know that yes, it is based on a book! The book is the Widderburn Horror and from what I've been reading here, it's considerably better than this movie.
I had always felt that it would make a good movie so I did a search on it and ended up here only to be sadly disappointed. If someone would do it properly, I still think it would make a fine movie. The book has it all, witchcraft, devil worship, werewolves - actual transformation into a wolf, not some horror film monster, and a family of witches going back centuries that could be the inspiration for Anne Rice's witches in the Witching Hour. Not to mention a story of unrequited love.
Considering how old the novel is, there is no indication of the time period and it could still work very well if it were set in the present day. If anyone is interested, you can find the book on amazon, used of course. It's the Widderburn Horror by R.Warner-Crozetti aka Lora Crozetti. As far as I can tell, it's the only book she ever wrote and it seems that it was meant to be the first of a series but never went any further.
Considering all the remakes being produced today that are pointless and inferior to the original, this is one book that cries out for someone to do it properly.
