Thursday, September 19, 1985. 7 AM, Mexico City. At the General Hospital, Dr. Ángel is handling a complicated delivery. In downtwon, Camila, an amateur journalist, is working on an independent report. In Tlatelolco, Gabriela heads to work while her husband and children get ready to start the day. The minutes slowly approach 7:19 AM... the hour that changed the course of an entire nation.

A year earlier, Camila tells her family about her dream of becoming a journalist and leaves Guadalajara. In 1985, an hour after the earthquake, signs of life are found under the rubble at the General Hospital. Gabriela, worried about her children, heads back to Tlatelolco amidst the chaos. Meanwhile, Camila discovers a group of women trapped in a garment factory.

In the 1950s, Ignacio promises his dying mother that he will always take care of his younger brother, Ángel. In 1985, two hours after the earthquake, Ángel continues his rescue efforts when Ignacio visits him. Camila encounters Gabriela near Tlatelolco, where the police are not allowing anyone to enter. Beneath the rubble, Alberto finds another survivor.

Months earlier, Lucía and Pablo fall in love during a band rehearsal, with Lucía providing Pablo refuge from his home problems. Now, eight hours after the earthquake, they remain trapped under the rubble, running out of oxygen. At the General Hospital, a miracle amidst the tragedy occurs. Meanwhile, Camila, deprived of her freedom, may receive help from an unexpected source.

Nine hours have passed since the earthquake that shook Mexico City. Camila remains a target of the government, with Ignacio issuing orders to prevent anyone from entering the rubble, despite being so close to rescuing Rosario and the baby. Ángel faces a critical decision. In Tlatelolco, Lucía and Pablo’s lives hang by a thread, but unexpected help might change everything.