Night Monster

A wheelchair-bound magnate whose supposed paralysis masks a murderous will. He orchestrates the doctors' deaths and other acts of violence from his swamp estate, displaying a cold, calculating mindset.

One of the doctors invited to treat Ingston; he becomes a victim as the line between cure and conspiracy blurs.

Another physician in the trio who faces a grim fate as the mansion's danger escalates.

The third physician summoned to diagnose and cure; his murder marks the unraveling of the household.

A psychiatrist invited to assess Margaret and challenge the estate's grip; she allies with Dick Baldwin to uncover the truth and survive.

A mystery writer neighbor who helps expose the killer and helps rescue Lynn; pursues the killer across the swamp estate.

A stern housekeeper whose management of the household contributes to the oppressive atmosphere and complicates the investigation.

An Eastern mystic whose materialization tricks provide the mechanism for the killer to create limbs at will, enabling murders.

A shriveled gatekeeper who watches the estate’s gate, adding a chilling presence to the property’s defenses.

A lecherous chauffeur whose reckless behavior foreshadows danger and ultimately contributes to the body count.

The town police captain who assists in the investigation, pursuing the truth alongside the visitor-cum-hero.

Kurt's sister, thought to be mentally ill, who helps drive the plot from within; her fate is sealed as the house burns.

A former household employee who becomes enmeshed in the growing web of suspicion surrounding the estate.

The grim-humored butler who watches the gates and maintains the household’s intimidating order.

A neighbor in the household circle; a minor figure amidst the fear surrounding the swamp estate.