No adults, no permit, no river map. After fifteen-year-old Jessie gets sent to Discovery Unlimited, an outdoor education program, she and six companions “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, and exploring caves and waterfalls, Jessie and the others are having the time of their lives—at first. But when they’re 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? This riveting novel includes an author’s note about his own rafting experiences and has been ranked by the American Library Association as a “100 Best of the Best” for twenty-five years—a testament to the enduring popularity of the action and adventure that await in Downriver.