The chieftains of Sevenwaters have long been custodians of a vast forest, one of the last refuges of the Tuatha De Danann, the Fair Folk of ancient story. Human and Otherworld dwellers have existed there side by side, separated by a thin veil between worlds and sharing a wary trust. Until the spring when Lady Aisling of Sevenwaters finds herself expecting another child, and everything changes.

With her mother pregnant, Clodagh fears the worst since Aisling is well past the safe age for childbearing. Clodagh's father, Lord Sean of Sevenwaters, faces his own difficulties as warring factions threaten his borders. When the baby is born the unthinkable happens, and Clodagh's world is turned upside down.

To set things to rights for her family and for all the people of Sevenwaters, Clodagh must enter the shadowy Otherworld and confront the powerful prince who now rules there. Accompanied on her quest by a warrior of uncertain allegiance, she will have her courage tested to breaking point. The reward may be far greater than she ever dreamed.