Thursday, September 19, 1985. 7 a.m., Mexico City. At the General Hospital, Dr. Angel is in charge of a complicated birth. In the historic center, Camila, an amateur journalist, is doing an independent report. In Tlatelolco, Gabriela goes to work while her husband and children prepare to start the day. The minutes slowly approach 7:19.

In the 1950s, Ignacio promises his dying mother that he will always take care of Angel, his younger brother. In 1985, two hours after the earthquake, Angel is still working on his rescue work when he receives a visit from Ignacio. Camila meets Gabriela near Tlatelolco, where the police are not letting anyone through. Under the rubble, Alberto meets another survivor.