The Middle Fork of the Salmon River in central Idaho is known as the original River of No Return. Once rafters put in at Boundary Creek, they must travel 106 miles to reach the takeout on the Main Salmon. Adventurers enjoy eight days and seven nights of isolated wilderness, dangerous whitewater, with only a few single-manned ranger stations in case of emergencies. This summer, they're not alone.something ancient and predatory has come home. Now, trapped within the 7000-foot deep canyon, Bobby Aldrich and his twelve companion's whitewater "trip of a lifetime," becomes a desperate struggle simply to stay alive.