Flies through the emptiness of space Barcelona 17, the star house of hundreds of millions of people, the ship is a generation. Flies abandoned by residents. Simon Paul is a raven, a sky-luther, a descendant of those who once condemned to death all the inhabitants of the city in the void. A descendant of executioners? No, it isn't! descendant of the biggest losers in habitable space. He feasts on forgotten things, fights with home robotics and in general, is happy, as any boy of fifteen who has real wings can be happy. But one day he meets Trait. An artificial intelligence that originated on a forgotten computing module. And Simon has a bitter truth to learn: Cars go crazy, too.