After witnessing the murder of her mother by her father, the daughter of Jack the Ripper becomes possessed by his spirit whenever she is put into a trance by glittering lights and then kissed.
This early seventies Hammer film has a lyrical edge that makes it feel quite unlike a Hammer film on occasion; I attribute this to the fact that the score came from Christopher Gunning, who is not one of the regular composers of Hammer scores. The movie is a bit of a mixed bag; the premise itself is interesting, and it is grounded by a strong performance from Eric Porter as a doctor intent on learning about murder by studying the daughter of Jack the Ripper. Unfortunately, the script itself is rather improbable; apparently, the series of events where the daughter becomes possessed rarely happened for years, and then suddenly occurs four or five times in one week. Also, I found it difficult to believe that one character lasts as long as he does and remains as active as he does after having been impaled with a long sword. Still, when it's working, it's quite effective, and I thought its strengths outweighed its weaknesses, though I did find it curiously unsatisfying in the final analysis.