Julian (Alex Gonzalez) and his friend Luis (Miguel Angel Silvestre) are two neighborhood boys who are part of a gang of violent neo-Nazis, led by Solis (Javier Bardem). After start training in a gym, Julian is transformed gradually thanks to the discipline of boxing, the nobility of his coach (Carlos Bardem) and the love of a young latin girl (Judith Diakhate). All of this takes away from the group, but Luis is not ready to accept that leave the 'herd'.