Seems I totally overlooked one fairly well-regarded novel of witchery written under a pseudonym, C.S. Cody, of an author I've never heard of named Leslie Waller. So I give you The Witching Night in all its paperback (and hardcover) glory! Some very excellent and evocative art on these. The Bantam edition from 1974 above features groovy satanic hullaballoo by artist unknown, alas. I've seen lots of post-Exorcist paperbacks from Bantam with the same cover design/font, it was a whole thing I guess.Totally cool.
This is the original '53 hardcover, art by John Hall, all boobs and sultry eyes; then below is the Lancer 1968 edition with simply marvelous witchy art by Jerome Podwil. Love the lady, love the bats, poor dude in suit and tie besieged by supernatural forces. Some of my fave horror fiction cover art of late.
Finally, the Dell 1953 first paperback, looking quite a bit like those famous pulp noir paperbacks of the day. Doesn't look too satanic, really, does it? But dig on this quote from the book I found:
Abbie brought the body of the slaughtered kitten to her mouth. I could see the lips curl and her teeth gleam fiercely until the furry black corpse masked her face. But I could see her throat, that long, smooth white column, so soft, so delicately modeled in sweeping lines. I saw it pulse as a regular muscular motion within it drew up and down in measured rhythm. I knew what Abbie was doing. She was drinking the kitten's blood.
And many thanks to Sara from My Love-Haunted Heart, who sent me the 1963 UK paperback cover, from Corgi Books.