Humanity lives in the fear of a possible alien invasion. For the first time in history, a message in code coming from another planet, reaches earth. Some months later, the twelve thousand inhabitants of Sepulveda are placed in quarantine, leaving the site - zone, free for drug traffic - almost deserted. However, when a strange magnetic phenomenon occurs in the region, specialists suspect an alien attack. In this way, an astrophysicist, a specialist in UFOs is sent to the city to lead an investigation on the strange events.