No adults, no permit, no river map. Just some "borrowed" gear from Discovery Unlimited, the outdoor education program Jessie and her new companions have just ditched. Jessie and the others are having the time of their lives floating beneath sheer red walls, exploring unknown caves and dangerous waterfalls, and plunging through the Grand Canyon's roaring rapids. No one, including Troy, who emerges as the group's magnetic and ultimately frightening leader, can forsee the challenges and conflicts.

What will be the consequences of their reckless adventure?