Pressured by his father and mocked by his peers, Tiuri, 15, competes to become a Knight of Dagonaut, just as the kingdom faces a dark threat.

With the Red Riders and Novices hot on his trail, Tiuri makes his way to Mistrinaut, where the mayor's daughter takes an ardent interest in his mission.

Ardanwen guides the group to a weirdly empty town; Lavinia helps Tiuri practice controlling his powers; a startling discovery divides the Novices.

As the Blood Moon nears and Viridian prepares for his homecoming, Tiuri and friends wrestle with doubt, betrayal and an intimidating final test.