Due to an unfortunate series of events, a teenage girl named Carmilla is left in the care of a wealthy widower and his daughter, Laura. Laura, upon meeting the poor girl, comes to realize that she knows her face. Years prior when she was but a child, Laura was haunted by a presence in her room with the likeness of the young girl. Convinced it was just a nightmare, Laura and Carmilla become fast friends. But as Carmilla's stay continues, strange things begin to happen to the townspeople nearby. It's not until Carmilla disappears that Laura and her father discover the truth about their mysterious houseguest.