Cette adaptation du roman Le Chevalier de Riouclare de Claude Boncompain a lieu au XIX siècle, au cours d'un hiver glacial, au pied d'une montagne en Auvergne avec de la magie, des péripéties et une fin heureuse.
Holmes and Watson are in Canada attending a conference on the occult, when Lord Penrose receives a message that his wife Lady Penrose has been murdered in the small village of La Mort Rouge. Holmes and Watson are about to return to England when Holmes receives a telegram from Lady Penrose, issued before her death, asking for help as she fears for her life. Holmes decides to investigate her death.
World-famous opera singer Alice Alquist has just been murdered. The perpetrator bolted, without the jewels he sought, after being interrupted by a child—Paula (Terry Moore)—Alice's niece, who was raised by her aunt following her mother's death.
The film focuses on the exploits of the vengeful Dr. Gustav Niemann (Boris Karloff), who escapes from prison. He is helped by the hunchback Daniel (J. Carrol Naish), for whom he promises to create a new, beautiful body. The two murder Professor Lampini (George Zucco), a traveling showman, and take over his horror exhibit. To exact revenge on Bürgermeister Hussman (Sig Ruman), who had once caused his imprisonment, Niemann revives Count Dracula (John Carradine). Dracula seduces Hussmann's granddaughter-in-law Rita (Anne Gwynne) and kills Hussmann himself, but in a subsequent chase, Niemann disposes of Dracula's coffin, causing the vampire to perish in sunlight.
After the death of his wife Irena (Simone Simon), Oliver Reed (Kent Smith) has married former co-worker Alice Moore (Jane Randolph), and they now have a six-year-old introverted daughter, Amy (Ann Carter). Amy has trouble at school because she spends too much time daydreaming, no matter how much Oliver tries to encourage her to make friends and cope with reality. After Amy finds a photo of the deceased Irena, whose name is never mentioned in the house, Irena appears to her and the two strike up a friendship. At the same time, Amy befriends Julia Farren, an aging actress who is alienated from her own daughter Barbara (Elizabeth Russell), whom she suspects to be a "spy" only pretending to be her relative. Oliver, angry at Amy for repeatedly speaking of her new imaginary friend, punishes her. When Irena announces to Amy that she must leave her, Amy runs out of the house. A snow storm comes up, and Amy seeks shelter in the Farrens' house. Barbara, mad and jealous at her mother's preference for Amy over her, intends to strangle the girl. At this moment, Amy sees Irena's features in Barbara and embraces her. Barbara, perplexed by this gesture of affection, spares her life. Oliver arrives at the house and takes Amy home, promising to accept her fantasies.
Nicholas (George Zucco) runs a filling station in the sticks. In reality, he is helping Dr. Richard Marlowe (Bela Lugosi) capture comely young ladies, so he transfera their life essences to his long-dead wife. Also assisting is Toby (John Carradine), who lovingly shepherds the leftover zombie girls and pounds on bongos during voodoo ceremonies. The hero is a Hollywood screenwriter who, at the end of the picture, turns the experience into a script titled "Voodoo Man." When his producer asks who should star in it, the hero suggests ... Bela Lugosi.
A Romany princess descended from Marie LaTour has the ability to change into a wolf at will, just like her late mother. When she learns that Marie LaTour's tomb has been discovered, she decides to use her talent to kill everyone who knows the location, because it is a sacred secret that only her people are allowed to know.
Artist Dave Stuart is blinded by a jealous assistant. The father of his fiance offers an operation to restore his sight, but Stuart will have to wait until the man dies. The benefactor dies a premature death and Stuart becomes a suspect.
David Davies, un célèbre chef d'orchestre, apprend qu'il ne lui reste que trois mois à vivre et son médecin lui propose de faire un séjour à The Halfway House, un petit hôtel situé dans une partie isolée du Pays de Galles. Parallèlement, Richard French est également en route pour l'hôtel avec sa fille, Joanna, qui à son insu ses parents discuter de leur projet de divorce. À la gare, ils rencontrent un jeune couple, Terence et Margaret, et tous les quatre marchent ensemble jusqu'à l'hôtel. Se rendent également à l'hôtel William Oakley, un profiteur de guerre, et son ami le capitaine Fortesque, qui vient de refuser de travailler comme directeur de prison parce qu'il ne veut pas contribuer à l'effort de guerre.
An eager scientist (John Carradine) tests his new formula for invisibility on an escaped fugitive (Jon Hall). When the formula works the criminal runs off to terrorize a family he believes cheated him out of a fortune years earlier.
The film begins with shadowy images on a wall showing a man being attacked by what appears to be a woman. He produces a needle from his pocket and administers its contents to his assailant. She falls to the ground, apparently dead.
The film is about the attempts to keep alive the brain of a multimillionaire after his death, only to create a telepathic monster. The man then takes over the medical assistant's mind, and the "lady" of the title has to fight it.
Dr. Markoff (J. Carrol Naish) has concocted a formula that spreads a hideous disease named acromegaly - which extends bones and distorts facial features. Markoff has no moral dilemma in experimenting on unsuspecting human subjects. His amoral behavior assumes monstrous dimensions when famed concert pianist Lawrence (Ralph Morgan) is injected with the doctor's disease-inducing serum. In return for an antidote, Markoff intends to exact more than his pound of flesh by extorting a fortune from Lawrence and demanding the hand of the musician's pretty daughter Patricia (Wanda McKay).