16 year old Prince Dor must fill in as temporary king while King Trent and Queen Iris are away on business in Mundania. Two wweks pass, no Trent. Dor decides he (Trent) must have been captured. He gathers a search party, consisting of an ogre, a golem, a centaur, and Princess Irene, who is way more than willing to be Dor's Queen. The party set's off to the Good Magician Humfrey, to ask how they could rescue Trent. Humfrey tells them to seek the Centaur Aisle. So they set off toward Centaur Isle in the south. Mundania, of course, lay to the north. Ingenious plot, as always. Piers Anthony never fails to bring his immortal characters to life.