Coming back from work by night, shy watchmaker Tommaso runs over a girl with his car, luckily without serious consequences. Next day he finds her waiting for him at his door. She asks him for help, as she can't remember anything prior to the incident.

Eight Italian politicians from the communist party gather on a terrace in Rome for a get-to-gather. They discuss about their past, present and future.

A series of random suicides in Rome, Italy are attributed to a heatwave, but a young pathologist named Simona—who is working on a thesis about murders disguised as suicides—suspects otherwise. When a young girl associated with Simona's playboy father ends up dead in another apparent suicide, Simona teams up with the girl's priest brother to prove she was murdered and track down the unknown serial killer.