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 Calambás, an Indígena, who has lived along the El Furioso all her life. Though she loves its rushing waters, she dreams of leaving to get an education so that she can help her people. Her dreams, and her very survival, are in the balance when she and Rex are caught up in the clash between paramilitaries, working for rich landowners, and guerillas, who are supposed to be protecting the poor.