Martin is a mentally disturbed loner who lives with his mother in a bleak housing project. He works the night shift as a security guard in an equally grim and foreboding underground parking complex. To escape his dreary existence, Martin loses himself in the fantasy world of the cult horror film , fetishizing the meticulous surgical skills of the gifted Dr. Heiter, whose knowledge of the human gastrointestinal system inspires Martin to attempt the unthinkable.