13 GHOSTS

The occultist Dr. Plato Zorba bequeaths a large house to his impoverished nephew Cyrus. Along with his wife Hilda, teen daughter Medea and adolescent son, Buck, Cyrus is informed by lawyer Ben Rush that the house comes with ghosts that Dr. Zorba has collected from around the world. The will stipulates that the family must stay in the house and cannot sell it, or it will be turned over to the state. The family is shocked to find that the house is really haunted by 12 ghosts. The furnished mansion also comes with a creepy housekeeper, Elaine, who conducts seances, and, unknown to the family, a hidden fortune concealed somewhere on the property. The spirits include a wailing lady, clutching hands, a fiery skeleton, an Italian chef continuously murdering his wife and her lover in the kitchen, a hanging lady, an executioner holding a severed head, a fully grown lion with its headless tamer, a floating head and a ghost of Zorba himself, all held captive in the eerie house and looking for an unlucky 13th ghost to free them. Dr. Zorba also leaves a set of special goggles, the only way of seeing the ghosts. A Ouija board warns the family that a death will occur in the house.

Rush, the estate executor, knows Zorba's fortune is hidden somewhere in the house, having unsuccessfully searched for it previously. When two $100 bills fall loose after Buck slides down the stairs, Rush tricks Buck into secretly searching for the money. After Buck finds the cash under the stairs, Rush carries the sleeping boy out of his room and attempts to murder him in the same way that he killed Zorba: using a four-poster bed equipped with a descending canopy that fatally suffocates people.

Zorba's ghost appears, killing the terrified Rush by driving him under the canopy as Buck awakens and escapes. Rush has become the 13th ghost. The next morning, Cyrus and his family count the recovered money and decide to stay. Elaine says the ghosts have left but predicts they will return, much to Buck's delight. Unseen by the family, an unseen force blows the special glasses into smithereens. Elaine gets a broom and permits herself a small enigmatic smile.

Rush is killed by Dr. Zorba's ghost and becomes the 13th ghost as the family finds the hidden money and decides to remain in the house.

The climax sees the real villain, Rush, undone by the supernatural forces he tried to exploit for personal gain. The Zorbas’ victory is both material and spiritual—they secure the hidden fortune and survive the mansion’s dangers, while the haunting element is resolved for now. The housekeeper’s enigmatic smile hints that, in the world of William Castle, no ghost story is ever truly over.