Book excerpt: Challenge Windzer, the mixed-blood protagonist of this compelling autobiographical novel, was born at the beginning of the twentieth century "when the god of the great Osages was still dominate over the wild prairie and the blackjack hills" of northeast Oklahoma Territory. Named by his father to be "a challenge to the disinheritors of his people," Windzer finds it hard to fulfill his destiny, despite oil money, a university education, and the opportunities presented by the Great War and the roaring twenties. Critics have praised Sundown generously, both as a literary work and a vignette into the Native American past.