et on the border, where Mexico becomes the crucible and the fearsome gangs of today’s Mexican countryside, the gauntlet, to freedom. The stories of a girl living in Honduras and hungering for a brighter future, and two teen gang members, for whom the Mara Salvatrucha is near their entire universe, become interlaced on the train to the border, a journey that will determine the future of their lives

Overview from themoviedb.org