Based on

Movies like Plot of Fear (1976)

Plot of Fear tells the story of a decadent weekend party full of orgies and drugs on the outskirts of Milan. Inspector Lomenzo investigates a series of bizarre murders, each linked by the fact that pages from the German children’s book "Shock-Headed Peter" have been left at the scene of the crime. As the bodies pile up, Lomenzo is guided by a model and a surveillance expert to a decadent club frequented by the rich and powerful.