There are three old tombs at the back of the little cove at the upper end of the steep-sided mountain lake of Crilmede. The only way in is by boat, or the narrow, crumbling track that starts a mile back along the shore.
Two of the tombs belong to princes of the Ellfolk, but the last one, the deepest and darkest, belongs to one of the old druit arch-priests, a powerful and cruel magician. They say fifty warriors with spear and shield were sacrificed and their bodies tipped into the dark depths of the cove – but sacrifices or not, they still answer the call of the arch-priest.
Problem is, no one remember which tomb is which. What are the chances that foolhardy grave-robbers would pass the wrong door at the end of the lake?