In the eerily warm spring of 1846, George Donner placed this advertisement in a local newspaper as he and a restless caravan prepared for what they hoped would be the most rewarding journey of a lifetime. But in eagerly pursuing what would a century later become known as the "American dream," this optimistic-yet-motley crew of emigrants was met with a chilling nightmare; in the following months, their jingoistic excitement would be replaced by desperate...