Walter and his father, during a trip outside the city, give a ride to Ivano, a young man passionate about birdwatching. A few hours later, the young man is found dead, and not far away, the bodies of a young couple are also discovered. In the following days, another murder occurs in the same wooded area of “Torraccio.” The journalist soon realizes that he is dealing with a dangerous serial killer, and that his father, in poor health, has seen the killer's face, thus putting himself in serious danger