: Their daughter, who is on a research trip with her father.
As the "countdown to disaster" ticks down, Kate and Rob must work from different ends of the catastrophe to reunite their family and find a way to deactivate the weapon before the final shockwave triggers a global extinction event.
As the Earth's crust begins to fracture, Kate, a geophysicist and the only person who truly understands the weapon's catastrophic potential, realizes that these tremors are just the beginning of a chain reaction that could tear the planet apart. The narrative follows two parallel paths: