Pressured by his father and mocked by his peers, 15-year-old Tiuri 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 a keen interest in his mission.

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