Quest of the Delta Knights

The plot revolves around a young boy named Travis (nicknamed "Tee") who learns from his master that he is the key to saving the world from an evil plot. Tee joins the secret organization of the Delta Knights and embarks on a quest to attempt to recover the lost treasures inside the fabled Lost Storehouse of Archimedes. The plot is markedly similar to that of Robert Heinlein's Citizen of the Galaxy, including its essentially identical setup of a young slave boy—who is really the lost heir of a powerful family—being bought for a pittance by a seeming beggar, who is himself really a spy, and who suspects the boy's true identity.