How do you control a force of nature as destructive and unpredictable as a wildfire? INSIDE travels onto the front lines of a battle as old as history, following a courageous team of firefighters as they work tirelessly to contain a fast-moving fire that threatens one of California's largest state parks and the communities that surround it. More than 1,900 fire personnel are in a battle against time, racing to contain the flames before the rising winds push them across their fire lines.