"In the 18th Century, a terrible witch is punished by the townspeople she terrorized by being drowned in a lake. Two hundred years later, a newlywed couple is driving near the lake when their car crashes into the water. The husband comes to the surface unharmed but his young bride emerges from the water possessed by the spirit of the witch, looking for revenge upon the descendants of the townspeople who had killed her," according to the DVD sleeve's synopsis.
Writer/director Michael Reeves's "The Sister of Satan" is an exasperating feature. After showing great promise with "Witchfinder General" (1968), Mr. Reeves died of a drug overdose. Although this film (aka "The She Beast") should not be considered representative, the opening and a few other scenes are nicely done. The idea to bring the story into the "Dracula universe" was a good one - but, the comic aspects do not fit. Worst of all, the sizzling pairing of Ian Ogilvy (as Philip) and Barbara Steele (as Veronica) is given short shrift.
***** The Sister of Satan (1966) Michael Reeves ~ Ian Ogilvy, Barbara Steele, John Karlsen