Leiber's CONJURE WIFE: Witchcraft and Dark Shadows!

I discovered Conjure Wife, Fritz Leiber's 1943 classic novel of witchcraft in academia, when I was a freshman in high school, and I devoured it greedily.  Fans of Dark Shadows should check it out as well, as we'll discuss in a moment:  the novel concerns sociology professor Norman Saylor and his lovely wife Tansy who, he discovers, has been using witchcraft to protect him and further his career.  Naturally (derp) he makes her stop.  Almost immediately he learns that every woman knows something or other about witchcraft, and Norman must race against time to save both himself and Tansy from the spidery faculty wives who, as the cover below states, have trapped them both in "a web of witchcraft."

Storyline aside, you can see from the cover -- this is my actual, very much loved copy -- that this edition, re-released in 1968, was aimed specifically at the Dark Shadows audience.

If you decide to not take my advice, you should at least check out the 1962 British adaptation Burn Witch Burn (known as Night of the Eagle in its native land), which, while over-simplifying the plot, is still a tense and suspenseful shocker and a decent adaptation.  Superior to the other two adaptations, Weird Woman (1944) starring Lon Chaney Jr., and Witches' Brew (1980) starring Terri Garr and a certain Kathryn Leigh Scott as one of the witchy faculty wives.  The latter two are currently available on the youtubes.