In the aftermath of the dam break, massive mudslides wreak havoc throughout Los Angeles. As Athena fights to save herself and an agoraphobic woman after her house collapses, Bobby, Hen and Eddie rush to save hikers endangered by the falling of the Hollywood sign. Meanwhile, Buck and Chimney must rescue a group of pregnant women trapped in a submerged house.
Fast-paced exploration into the high-pressure experiences of police, paramedics and firefighters who are thrust into the most frightening, shocking and heart-stopping situations. These emergency responders must try to balance saving those who are at their most vulnerable with solving the problems in their own lives.