The Brides of Dracula (1960) - Hammer

In Transylvania, the teacher Marianne Danielle is heading to a small village where she will teach French and etiquette for teenage girls. The stagecoach stops at a village and when Marianne is preparing to eat dinner, the coachman goes away and leaves her in the inn. Out of the blue, Baroness Meinster comes to the place and invites Marianne to spend the night in her castle, where she lives with her servant Greta. During the night, Marianne sees a man in a balcony and she learns that he is Baron Meinster, the insane son of the Baroness. Later Marianne believes that he will jump off the balcony and she goes to his room and finds that he is chained by his mother. Marianne decides to help him to escape and steals the key from the Baroness' room. Then she leaves the castle and is found by Dr. J. Van Helsing, who has been invited by the local priest to treat a disease. Soon Van Helsing learns that Marianne has unleashed a vampire that is murdering the dwellers of the village.