THE 1869 POWELL EXPEDITION...deep in a chasm of roaring water and soaring stone and at a deadly stretch of river now named Separation Rapids, three desperate men abandoned the expedition after months of unspeakable hardships and near starvation. But only one of the three could survive high up on the wild, uncharted North Rim. WILLIAM DUNN...a mountain man forever haunted by guilt and driven by the love of extraordinary women will cast his fate across the vast and magnificent Grand Canyon of the Colorado in an epic tale of undying courage. This is a story of fearless river adventurers, brave and beautiful women and the early Mormon pioneers all of whose lives are interwoven with the Navaho, Hopi and the Havasupai...“The People of the Blue Green Water.” GRAND CANYON THUNDER is a never to be forgotten American saga written by multiple award-winning author Gary McCarthy.