Thrice Bound | Roberta Gellis
When Hekate's tyrannical father, a powerful mage, makes one demand too many, Hekate flees to the Caves of the Dead where her father's magic cannot reach. But the caves are protected by a spell of terror and revulsion. To remain there without going mad, Hekate reluctantly takes on a second binding, to the Caves themselves, which will kill her if she fails to satisfy the forces that rule them.