Paul Pinwheel is now the crowned king of the far western lands of the Sea People of the Hidden Land. But things aren't that simple. The Dark Presence, demon ruler of the Empire of Gagoth and seeker of the domination of both worlds, has poisioned the mind of Paul's princess and prospective queen, Envallegond, by means of a foul device. Treachery and betrayal lurk in her very household and the demon is on the verge of obtaining the crystal, the key to the universe. Spies are everywhere and Paul and his cluster of loyal adherents, including shipmates of old, the sea witch Morgana and the strange seer Periel, have a challenge ahead of them. To make matters worse, minions of the demon have wreaked chaos in the small kingdom of Paul's world of origin, the Sky Land, and war threatens its existence and that of his family. In this, the final volume of the Pinwheel Chronicles, a clash between good and evil reaches its climax.