No adults, no permit, no river map. 15-year-old Jessie and her six companions from Discovery Unlimited, an outdoor ed program she's been sent to by her father, “borrow” the company's rafting gear and take off down the Colorado River through the Grand Canyon on their own. Floating beneath sheer red walls, camping on white sand beaches, exploring caves and waterfalls, Jessie and the others are at first having the time of their lives. Pursued by helicopters, they boldly push on into the black-walled inner gorge, the heart of the Grand Canyon, only to encounter huge rapids, bone-chilling rain, injuries, and conflict within the group.

What will be the consequences of their reckless adventure?