After inheriting a sprawling estate, a newlywed couple moves into a haunted mansion. As they settle in, they begin to uncover dark secrets from the past, including witchcraft, possession, and family history. The husband-wife relationship is tested as they encounter evil spirits, time travel, and reincarnation. The story takes a tragic turn with an unhappy ending, involving death, suicide, and betrayal. The movie explores themes of the sins of the father and the consequences of past actions.

In House of Dark Shadows, a vampire is unleashed from his mausoleum and returns to his old estate, where he reunites with lost love. As the curse spreads, a young boy becomes the target of the vampire's attack. The doctor must find a cure to save the family and stop the evil cousin's malevolent plans.