Alessio Rinaldi, a 25-year-old director, gets the charge from a producer to write the script of his first movie with Ubaldo Terzani, a well-known writer of horror novels. Alessio moves into Terzani's house to start this collaboration, and a strange relationship of psychological dependence grows between them: Ubaldo Terzani unveils his dark side, and Alessio falls into a state of insanity ruled by the script they are creating and the nightmares he has because of it.