In the Fifth Century, the World is changing. A conflict has begun between Christianity and the ancient religions. In the Shade, druids and monks are engaged in a war. As the Bretons occupy the rocky headland of Armorique, Gwenc' hlan, the last druid of this region, and Taran, his apprentice, try to thwart the traps set by their fanatical opponents. To succeed, they will need the help of Morrigane, a woman of the Other World...