In July 1776 a pair of Franciscan friars, Francisco Atanasio Domínguez and Silvestre Vélez de Escalante, were charged by the governor of New Mexico with discovering a route across the unknown Southwest to the new Spanish colony in California. They had other goals as well, some of them secret: converting the indigenous natives along the way to the true faith, discovering a semi-mythical paradise known as Teguayó, hunting for sources of gold and...