In 1865 a French priest was visited by a small group of Japanese at his newly built church in Nagasaki. They were descendants of Japan's first Christians, the survivors of brutal religious persecution under the Tokugawa government. The Kakure Kirishitan, or "hidden Christians," had practiced their religion in secret for several hundred years. Sometime after their visit the priest received a copy of the Kakure bible, the Tenchi Hajimari no Koto,...