: Their daughter, who is on a research trip with her father.

: Kate’s husband, fighting to keep their daughter safe during the earthquakes.

: The brilliant scientist who knows the truth about the Hellstorm.

: Meanwhile, Kate's husband Rob, a professor, is in California with their daughter Jessie and student Jake. They are caught in the escalating seismic activity at the San Andreas fault, unaware that Kate is at the center of the global crisis.