Dracula's Daughter tells the story of Countess Marya Zaleska, the daughter of Count Dracula and herself a vampire. Following Dracula's death, she believes that by destroying his body, she will be free of his influence and live normally. When this fails, she turns to a psychiatrist, Dr. Jeffrey Garth (Kruger). The Countess kidnaps Dr. Garth's assistant, Janet (Marguerite Churchill), and takes her to Transylvania, leading to a battle between Dr. Garth and the Countess in an attempt by him to save Janet.