I wanted to point out the obvious influence _The Omen_ had on this movie, but the two were released only a month apart. Weird, no? Hell, even _Rosemary's Baby_ didn't come out until the next year. Maybe it was just the era's response to the Satanic panic.
Anyway, the movie is very good. In fact, I'd say it is one of the best from Hammer, and a big departure from their typical period piece, gothic horror movies. Christopher Lee is great, as for usual. The rest of the cast are perfect, too; no dead weight.
_To the Devil a Daughter_ does drag in a few places, but is still gripping, nevertheless. It plays out more like a thriller/mystery with horror elements, and would be a perfect movie for a dreary October night.
My favorite part about the film is that it is deadly serious. No one is winking at the camera. There is no comic relief. Okay, baby Satan is a little silly, but it was likely the best they could do. Plus, he climbs inside Kinski's vagina - pretty brutal.
It's easy to see how this movie has inspired other horror directors' films (e.g., _The House of the Devil_, and _Lords of Salem_). Speaking of, the first bit of dialog here was sampled by White Zombie for "Super-charger Heaven." Maybe some of the scream too, hard to tell.