The writer embeds with the Hotshots, an elite group of wilderness firefighters, for a season:

“At 11 P.M., the crew hooks over the top of the spot and starts building line down the eastern flank and back toward the creek. Rojas is mowing through the brush when a flare-up sends a wash of embers overhead. Behind him, Cowell yells, ‘RTO! RTO!’ It stands for reverse tool order, which basically means get the hell out. The crews power through the brush to the top of the spot, where they pause to catch their breath.

“Burning mountains surround them, and Cowell has to make a decision. They either gamble and try to put out the spot fire by building a firebreak directly on its eastern edge, or they back off and take the line up to the ridge top. Option two is safer, but it gives the fire a chance to gain momentum. Cowell sends Rice downhill to scout. The foreman climbs a tree, sees emergency lights flashing 500 feet below, and hears another hotshot crew’s saws screaming in the night. The fire looks manageable. “We can do this,” Rice radios to Cowell.”