The Devil Rides Out (aka The Devil's Bride, in the U.S.), is a Hammer horror movie directed by Terence Fisher, starring Christopher Lee, that is not about vampires. Instead, he plays a Frenchman (in name only, it seems) investigating a possible Satanic cult in rural England.
Set in 1929, it's one of those period pieces that makes absolutely not effort to look like the period it is taking place in, aside from the cars. Most of the women's costumes are straight up 1968, not to mention the hair. I've heard this excused, at least for this movie, as being a benefit, because it results in a weird, timeless feeling. Maybe for some. For me, it's just a distraction.
But aside from that, this film has some really spooky moments! And the Satan and the Angel of Death cameos are straight-up gems, overcoming the limitations of the era's visual effects.
I watched it on Blu-ray, and it is also available to rent via Amazon. And if you have TCM, it will be airing on October 30th (as The Devil's Bride).