Ubaldo Terzani Horror Show (2011)

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 fall in a desperate depth of craziness and nightmares. There is a reason why Terzani's bestsellers are so frightening ... Alessio will discover that reality can be unexpectedly more terrifying than every brainchild, and he will have to fight hard to escape Ubaldo Terzani's jaws.

Source: TMDb