He seemed to him to be the most indifferent child in the world from the very beginning. The saddest... The most speechless... Then, one morning in front of the subway, Max receives an incredible gift from a one-armed beggar: a golden ticket that allows him to travel to places few can reach: the refuges. Only there can Max confront his sadness, only there can he change his life and save his heart. If he fails, the mechanical prince, the ruler of the refuges, will retain a terrible pledge from him, and, almost worse, his miserable life will continue as before...