In this psychological horror-thriller, a man returns to his motel after being released from prison, where he had been sent for committing a series of murders. He struggles to control his dark impulses when a young woman, who resembles his former victim, checks into the motel. As the bodies begin to pile up, the man's mental state deteriorates, and he becomes increasingly convinced that his mother's ghost is haunting him. The film builds up to a chilling climax as the man's psychosis reaches its breaking point.

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Some movies that have similar genres and were produced around the same time as Psycho III include White Dog, My Bloody Valentine, Dead of Winter, The Guardian, Leatherface: The Texas Chainsaw Massacre III, Stepfather 2.