Rome, February 24, 1987 Cristiano April is 12 years old, he is at home with his mother and older sister. A kind, thin -looking boy with eyeglasses plays the intercom. He says he had to collect an electrical engineering book left by his father, who is a professor. The mother makes him rise. A few moments are enough: the young man enters, pulls out a knife, seriously hurts the woman, hits his daughter, then he sets out on Cristiano. It strikes him twenty times. Winds. An execution, not a robbery. The boy knows the house, moves with confidence, he knows how to recognize a face portrayed in a painting. Before going out, bloody, pronounces words that suggest a personal bond with the family. Then he leaves. Walk, it doesn’t run. He passes in front of witnesses, but nobody stops him. It’s morning, there are schools, bars, offices. Yet the killer disappears into thin air. Despite the detailed description, it will never be identified. Since then, no culprits. No process. No answer to the questions that still torment those who have known that story today. Why hit Christian? Who was that boy really? And how is it possible that, in the city, such a visible killer has never been taken?