Why did you come to the United States? That is the first question of the admission questionnaire for undocumented children crossing the border alone. Using as a guideline this questionnaire that will determine his situation, Luiselli has entered into the reality of migrant children to show us an X-ray of both their past, present and future lives, and the labyrinthine and ruthless immigration system of the United States. This book is a brutal, intimate testimony, written with frank, brilliant and lucid prose, which observes the reality of migrant children from a distance located between the desire to remedy the existential helplessness in which they find themselves immersed and the impotence that they unleash. the inability to do it.