Plot of Fear 4K 1976

Milan. During a sadomasochistic game, a prostitute strangles a man in his own home. Soon after, an elderly woman is killed with a wrench on an empty bus. In each case, the killer leaves an illustration from the children's book Pierino-Porcospino at the scene of the crime. This is the eighth murder in the last 24 hours. Police Lieutenant Gaspar Lorenzo is investigating the cases. He meets a girl named Jeanne, who tells him about the strange accidental death of a prostitute named Rosa from the Wildlife's Friends club, owned by Mr. Hoffman. This was the club that the two victims of the maniac often visited. Lorenzo decides to turn to a private detective agency for help with the investigation...