Imagine medieval times where the dinosaurs never went extinct. Henry Fairchild, the lowly stable boy turned dinosaur-riding knight, is now a full member of the Dino Knights team, but he still doesn't feel like he fits in. When masked marauders invade Ellie's home village in the Highlands, stealing away all of the adults, Henry defies Lord Harding to lead a daring splinter group to investigate. Henry, Ellie, and her cousin Caden make the dangerous trek up into the mountains, where they soon discover the source of the incursion and learn that Brecklan is the next target. But who is behind such dastardly attacks? Can the Dino Knights come together as a team once again to stop them?