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.

The Red Riders drive their captives high into the snowy mountains. Caught in a storm, Tiuri and Lavinia take shelter inside an ominous monastery.

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