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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...

On the last day of a sea kayaking trip in southeast Alaska, fourteen-year-old Andy Galloway paddles away from his group to visit the nearby site where his archaeologist father died trying to solve the mystery of the first Americans. A sudden, violent storm blows Andy's kayak off course and washes him ashore on Admiralty Island, an immense wilderness known as the Fortress of the Bears. Struggling to survive, Andy encounters a dog running with wolves and then a man toting a stone-tipped spear. The wild man vanishes into the forest, but the dog reappears and...

Deep in trouble, deep in the canyons

Fourteen-year-old Dylan Sands has come all the way to the Big Bend on the Texas-Mexico border to paddle the fabled Rio Grande with his cousin Rio. As the boys are packing their raft and canoe for ten days in the canyons, six Black Hawk helicopters appear overhead and race across the river into Mexico. The Army warns them that a hurricane is approaching the coast.

Convincing themselves that their chances of running into a storm are slim, Dylan and Rio launch onto the wildest and most remote waters in the Southwest. Downriver, a man appears...

A meteorite is hurtling toward the Black Hills of South Dakota. . . .

Brady Steele's love for all things extreme is given a boost when a fireball crashes through the roof of his house. It turns out that Brady's space rock is one of the rarest meteorites ever found. In fact, a professor from a nearby museum wants to study it in search of extraterrestrial bacteria, hoping to discover the first proof of life beyond Earth.

During a wild week of extreme bicycling, fishing, and caving, Brady discovers he's able to do strange and wonderful feats that shouldn't be possible. At the...