Synopsis: Alejandro lives in the center of Mexico City in an enclosed, self-sufficient zone surrounded by ghettos and policed by a powerful private security force. As dawn breaks on his birthday, three teens from the adjacent poorer neighborhood break into one of The Zone's houses. In the confusion, an old lady is killed, but a young housemaid escapes and warns the security guards. The guards shoot two of the robbers, but the third escapes and remains hidden inside The Zone. The Zone's residents meet at Alejandro's family's house to discuss what to do. After a heated debate, they decide not to report the crime to the police and to hunt the burglars down themselves.