Sam is attacked by Monica in the gallery.
Sam finds out the identity of the assailant.
Sam arrives at the Ranieri's apartment to talk to Alberto.
Sam and Guilia are attacked and chased by an unknown accomplice of the assailant, but after outrunning him, Sam loses him to a crowd of similarly-dressed men at a boxing convention.
Sam and Morosini inspect previous convicts to understand the assailant better.
Sam discusses the revelations made by analysing the assailant's glove with the investigators.
Sam collects his paycheck and heads back to his apartment.
Sam recounts to Guilia how he witnessed the attempted murder and tries to make sense of his flashbacks.
While looking for clues, Sam discovers another murdered body.
Sam and Guilia go over the names and murder photos of the assailant's victims.
Sam tries to find Guilia.
The assailant attempts to murder Guilia.
Morosini and a psychologist sit down for an interview to discuss Monica Ranieri.
The assailant stalks the 4th victim at the racetracks.
The assailant attacks the 4th victim in her apartment, in the style of the painting from the antique store.
Sam is attacked on his way home.
Sam visits the antiques shop where one of the victims worked and tries to track down the painting bought by the assailant.
As the investigators inspect the scene of Monica's attempted murder, Sam tries to remember what he saw.
Sam inspects the painting that the assailant may have bought.
The assailant calls Sam at his apartment, warning him to abandon the investigation or his girlfriend will be the next victim.
The assailant calls Morosini and threatens him to stop the investigation or there will be be a fifth murder.
Sam and the investigators attempt to decipher the voices in the two phone calls made by the assailant.
Sam helplessly witnesses the attempted murder of Monica Ranieri.
An unknown, black-gloved assailant plans a murder and takes photos of a potential victim as the movie begins.