After a flash flood buries Zack's car in a mudslide, Whitney Lynd, CEO and Zack's agent, rushes to the Shelley house seeking him. Rescue teams say the road is wiped out and further landslides make entry impossible; every hour Zack stays buried is another step toward death. Zack's fiancée breaks down, blaming herself. Nearby, a survivor finds only bitter, muddy water and resolves to filter it to avoid illness. Zed and Ruby made it back to the Shelley family and may know Zack's location, so Whitney gets in the car and heads there as time runs out.