One day, without knowing how or why, the birds of a big city leave, disappear. It is believed to be a protest against environmental pollution. Some children (the Regaliz group), then embark on an ecological campaign to get the birds to return to the city.
Alicia lives off the men she blackmails with the help of her neighbor, the young Moisés. His victims include his boss, a friend of his, Jaime, and Mr. Borrás. One day she is found dead on the landing of the stairs.
After spending three months doing experiments in space, scientists Antón and Daniel return to civilization. They're astounded to discover that the Earth has undergone an enormous cataclysm and the law of the gravity has even been altered in the interim.
