William Thatcher, a peasant squire, seizes a chance to reinvent himself after his knightly master dies unexpectedly. Disguising himself as a noble, he enters jousting tournaments across Europe, driven by a fierce desire to “change his stars.” Along the way, he builds a loyal team, falls for the noble Lady Jocelyn, and clashes with the ruthless Count Adhemar. The story blends medieval adventure with modern energy as William fights—literally and figuratively—for honor, love, and a new identity.