The Monthly Film Bulletin wrote: "If Michael Reeves' second film is a trifle disappointing after the promise of
The Revenge of the Blood Beast (1966), it is probably because the direction is constantly undercut by stolidly pedestrian camerawork and indifferent colour. All the same, Reeves manages to build a considerable charge, particularly in the second half of the film, with a superbly baleful performance by Catherine Lacey (Karloff is his usual reliable self, but a shade weary), and a script which comes as close to authentic Sadisme as anything since
Peeping Tom (1960) in its detailing of the increasing urgency of Estelle's thirst for experience: from innocent splashing in a swimming pool and highway speeding on a motor-cycle, through the first taste of brutality to two murders, the first a flurried affair with scissors, the second much more leisurely and with the added refinement of prior terrorisation. It is the overall effect that impresses rather than any individual scene or composition (unlike
Revenge of the Blood Beast), but the "psychedelic experience" is particularly well done, with the victim's face literally disintegrating in blobs of colour."
Leslie Halliwell said: "Rather slight but oddly memorable horror film, with an elegant old lady becoming the real monster." On
Rotten Tomatoes, the film holds an approval rating of 100% based on , with a
weighted average rating of 7.3/10. At
Internet Movie Database, the film received an average score of 6.4 out of 10. == Accolades ==