For more than twenty years, Maria Paula Acu a has claimed to see the Virgin Mary, once a month, at a place called Our Lady of the Rock in the Mojave Desert of California. Hundreds of men, women, and children follow her into the desert to watch her see what they cannot. While she sees and speaks with the Virgin, onlookers search the skies for signs from heaven, snapping photographs of the sun and sky. Not all of them are convinced that Maria...