The Donner party in proper context

In “The Indifferent Stars Above,’’ Daniel James Brown, a historian whose previous book dealt with an 1894 Minnesota forest fire that killed hundreds of people, retells the saga assuming the reader knows the outcome. His interest is in humanizing the people and putting their travails in historical context.

Brown hangs his story on a 21-year-old bride named Sarah Graves, traveling from Illinois in 1846 with her new husband, her parents, and eight younger siblings.

The Graves family was tough pioneer stock. Early in the book, Sarah’s mother walks across the frozen Illinois River in just a calico frock to deliver herbs she promised to a new mother.

Brown draws from the many previously published accounts of the tragedy, letters from the party and those who knew them, accounts of life on the Oregon and California trails, genealogical databases, and his own travel along the trail, all documented in a 13-page listing of sources, but he tells the tale with a novelist’s touch. He can tell you about Elizabeth Graves’s river crossing because he has consulted written accounts by her neighbors and checked data from the US Naval Observatory, yet he writes, “That night, a storm raged across the Illinois prairies and a freezing wind howled up the river, shuddering through the chinks and cracks of the log cabins of Lacon on one side of the river and Steuben Township on the other.’’

The Graveses walk beside their oxen-pulled wagons to St. Joseph, Mo., and from there, across the prairie and into the Rocky Mountains. Along the way they join other migrants, including the Donners, and make a fateful decision to try an unproven short cut to California. Brown interrupts his story to describe, among other things, hygiene and birth control in the 1840s. He quotes modern medical studies on the effects of hunger, thirst, and privation on people, especially those exerting themselves strenuously.

By the time Sarah Graves and the Donner party reach Truckee Lake in the Sierra Nevadas, where they are trapped by a heavy snowstorm, they have expended most of their energy and resources. What happened next unfolds again in spare but excruciating detail. Every death is accounted for. The survivors are followed with less detail to the ends of their lives.

In addition to his source pages, Brown provides 25 pages of chapter notes, an author’s note explaining his purpose in writing the book, and a prologue and epilogue in which he sets up his story and draws his conclusions.

By the end, a reader feels spent, too, and thankful to live in the 21st century when Napa Valley is a seven-hour plane ride away.

David M. Butler is a member of the Globe staff.