In 1896, a Norwegian immigrant and mother of eight children named Helga Estby was behind on taxes and the mortgage when she learned that a mysterious sponsor would pay $10,000 to a woman who walked across America. Hoping to win the wager and save her familyś farm, Helga and her teenaged daughter Clara, armed with little more than a compass, red-pepper spray, a revolver, and Claraś curling iron, set out on foot from Eastern Washington. Their route...