Young Henry, who sees visions where others see only meaningless patterns, undertakes a quest, venturing into the Necromancer's realm. With his staunch companions Byron and Nadia, Henry outwits a giant serpent, defeats a pack of trolls, finds a long-hidden treasure, overcomes the Necromancer, and discovers that he is the rightful heir to the throne. Henry vows to knight Byron and marry Nadia, and "thus the kingdom prospered . . . as anyone with vision could foresee."
The references to vision allude to the "magic eye" illustrations that appear frequently throughout the book. (15 in all)