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 with a seven-year-old boy, begging for help . . . and the storm is upon them. Danger, suspense, and the ever-looming troubles in Mexico drive this white-knuckle adventure forward at a breakneck pace.