Montana-born Rex loves nothing more than to take his kayak out on a river, the faster and more powerful the better. When he gets the opportunity to tackle the well-named El Furioso in southwest Colombia, he is thrilled. He anticipates the river's challenges, but finds himself in a situation where the real danger is human. In Colombia, he meets Myriam Calambas, an indigena, who has lived along the El Furioso all her life. Though she loves its rushing...