She-Wolf of London

In the turn of the century in London, the aristocratic lawyer Barry Lanfield proposes to marry the heiress Phyllis Allenby and she accepts. Phyllis lives in the family manor with her "aunt" Martha Winthrop, her pseudo-niece Carol Winthrop and the housemaid Hannah. Out of the blue, dreadful murders happen in a nearby park and Detective Latham believes that they are victims of a werewolf or a she-wolf, but his superior Inspector Pierce says that they are victims of an animal. Meanwhile, Phyllis finds blood on her hands, and her shoes and clothing dirty and she believes that she may be killing people under the influence of a family curse. Who might be the serial-killer?