A psychiatrist, Dr. Allan Barnes, becomes involved in a case that revolves around an ancient, tribal mask. This eerie artifact is sent to him by one of his patients, who claims it induces nightmarish hallucinations and uncontrollable violence when worn. Despite his initial skepticism, Dr. Barnes decides to investigate the mask's mysterious power. He is quickly drawn into a macabre world as he decides to put on the mask himself, experiencing a series of nightmarish visions that challenge his sense of reality and sanity.

As Dr. Barnes delves deeper, he finds his rational mind increasingly besieged by the mask's dark influence. The more he tries to understand its origins and purposes, the stronger its hold on him becomes. In his pursuit of truth, Allan must navigate the fine line between scientific inquiry and supernatural horror, making it increasingly difficult to determine whether he is uncovering hidden truths or losing touch with reality. The gripping narrative blends psychological tension with surreal horror, intensifying as Barnes's obsession with the mask grows.