File 4. The year is 1912. Sir Arthur Conan Doyle is invited to visit South Africa by a veteran of the Boer War whose life he saved over a decade earlier. In Cape Province the famous author is confronted by a sinister people keep disappearing without a trace. The authorities claim that a gang of kidnappers is responsible, and the local inhabitants respond to Doyle’s investigations with hatred and silence. Then one of the missing persons returns. He is demented and violent, and his tongue is as black as coal. His body and mind have undergone a frightful transformation. From one minute to the next, Doyle enters a world midway between life and death…