In So Great a Light, So Great a Smoke, Louisa A. Burnham takes us inside the world of a little-known heretical group in the south of France in the early fourteenth century. The Beguins were a small sect of priests and lay people allied to (and sharing many of the convictions of) the Spiritual Franciscans. They stressed poverty in their pursuit of a Franciscan evangelical ideal and believed themselves to be living in the Last Days. By the late thirteenth century, the leaders of the order and the popes themselves had begun to discipline the Spirituals, and by 1317 they had been...