Roman imperial forces are massing to invade and enslave Caledonia.  Wiglaff, son of the great warrior Mordru, is shunned by his father as unsuitable warrior material.  An unusual child, Wiglaff has visions and an uncanny relationship with the natural world.  He becomes the  protégé of the shaman Ugard and learns how to focus his powers to bring rain and affect events.  

Meanwhile, Wiglaff's warrior sister Winna, quietly forms a band of warrior women from the nearby villages.  The shaman, his...