Dr. Frankenstein (Peter Cushing) has discovered how to contain the soul of somebody after they had died. His helper Hans (Robert Morris) is (unjustly) found guilty of a murder committed by three other men and guillotined. Hans' girlfriend Christina (Susan Denberg) kills herself. Frankenstein saves Hans' soul and puts it in her. She comes out as a beautiful woman but has Hans thirst for revenge...
As you can see logic does not play a strong role in this picture. For one thing Denberg is introduced as a dark haired, horribly scarred woman. After the "operation" she's blond-haired and looks perfect! Also, when she goes out to kill the men responsible for Hans death, she seems to know EXACTLY where they'll be (I love how she just guessed that Johann would be in a coach and it would break down). Still, Hammer films were never strong on logic so this can be forgiven. Also there's some dreadful day-for-night shooting (another Hammer trademark). Despite all this I DO love this film. It moves quickly and has some pretty bloody scenes (for 1967). There's also a flash of nudity in a bedroom scene.
The acting is very good. Thorley Walters gives a good performance as Dr. Hertz; Morris is actually pretty good as Hans; even Denberg isn't bad (although her voice was dubbed). Best of all, of course, is Peter Cushing. He plays Frankenstein to perfection showing the doctors obsession with creating life.
One of the better Hammer Frankenstein movies. Just turn off your mind and enjoy. I give it an 8.