"Wallis has delved into an extraordinary mass of original material, documents, diaries, accounts and letters, as well as new sources apparently not available to previous authors, and produced not only a definitive account of the Donner tragedy, but also a book so gripping it can scarcely be put down. . . . Wallis has done a superb job sifting through lurid tabloid moralizing and unreliable accounts to explore the complex truths of human beings pushed to the absolute limits of existence."