In a bustling Los Angeles, lives intersect amidst everyday challenges and ambitions. Structural engineer Stewart Graff struggles with his marriage to Remy, who harbors her own demons and desires. Meanwhile, police officer Lou Slade faces disciplinary action, grappling with his sense of justice. Both men are unknowingly on the cusp of a seismic disaster that will test their resilience and morality. Miles away, seismologist Dr. Frank Adams detects unusual activity but faces bureaucratic inertia in his quest for an early warning system. As tensions rise, relationships face a tipping point amid personal and professional turmoil.

Suddenly, a catastrophic earthquake erupts, causing widespread devastation and chaos throughout the city. Buildings collapse, trapping countless individuals beneath rubble, while emergency services scramble to respond. Graff and Slade's paths converge as they navigate the treacherous aftermath, each determined to save lives despite overwhelming odds. Amidst the destruction, human connections are forged and tested, embodying both the fragility and strength of the human spirit. With time running out, the survivors face life-or-death choices, revealing true character in the face of this natural calamity.