Martillo, tells the story of Pablo’s sexual awakening, a student at a boys' school where Sister Edwin teaches discipline with an iron hand. At home, Pablo lives in a different world. His father is a plastic surgeon and shamelessly exposes him to his sexual world and that of his lover. His mother is dead and Albina, his nanny, takes care of him like a son. At thirteen, Pablo is confused. When he discovers Sister Edwin's secret, he will leave his innocence behind.