Phyllis Allenby is a young and beautiful woman who is soon to be married to lawyer and boyfriend Barry Lanfield. Phyllis is living at the Allenby Mansion without the protection of a male, along with her aunt Martha and her cousin Carol and the servant Hannah, and when the wedding date approaches closer, London is shocked from a series of murders at the local park, where the victims are discovered with throats ripped. Many of the detectives at Scotland Yard begin murmuring about werewolves, while Inspector Pierce believes the opposite and suspects of strange activity at the Allenby Mansion (which is near the park), where the “Wolf-Woman” is seen prowling from it at night and heading for the park. Phyllis begins becoming extremely terrified and anxious, since she is convinced that she is the “Wolf-Woman”, deeply believing in the legend of the so-called “Curse of the Allenbys”. Aunt Martha tries to convince Phyllis how ridiculous the legend sounds, while she (aunt Martha) and Carol are suspicious in their own ways. Phyllis each day denies of Barry visiting her, and when a suspicious detective is murdered soon after he visits the mansion is murdered in the same way of how the other victims were murder, Barry begins believing that something else is beside the so-called “Werewolf murders” and makes his own investigations both to the park and to the mansion.