The document provides a summary of a book about the Donner Party written by Marian Calabro. It discusses the author's background, the thesis of the book being to recount the hazardous journey of the Donner Party. The summary also discusses that the author maintains an unbiased and wide scope in detailing key events without omitting important details, and that the book is well-organized and readable. It concludes with two positive professional reviews praising the book's gripping narrative and careful research.