The violent lives of Mexican street kids are examined in this intense Mexican social drama that centers upon the friendship between two adolescents. Mauricio has come from Tijuana to Mexico city to visit El Boy. El Boy teaches Mauricio about life in the streets of Mexico's capital. El Boy kills a security guard at a small market and must leave the city and hide out. The opportunistic Mauricio betrays his friend by impersonating El Boy and selling Boy's aunt's mortgage papers to a fence. Still pretending to be El Boy, he then gets involved with a young woman who stays at the property. Unfortunately, El Boy returns and a major confrontation ensues.