Maeven wakes to find her body possessed by Thulor's powerful demon enemy. Only when he sleeps, is she free to act - to be a thief and spy within the citadel of the enemy.
When the demon, Ciabolo, realises she is still aware, he inflicts an even worse fate – keeping her essence alive, while he is still protected from dragon magic and able to draw on it himself.
Magic and fighters are not enough to kill the demon and King Westron wants to rescue Maeven in the hope she has learnt the demon's weaknesses. He is drawing together people from other lands as well as his own, seeking ways for humans and the few remaining dragons to defeat the demon.
Can they oust the demon from her body, and bring her back to it? Has she found the answer they need?