It is a romance book. Castle in the Air follows the adventures of Abdullah, a handsome young carpet salesman from Zanzib, who day dreams constantly about being a stolen prince. One day a strange traveler comes to his stand to sell a magic carpet. During the night, Abdullah goes to sleep on the carpet but wakes up to find himself in a beautiful garden with a young woman. He tells the woman, Flower-in-the-Night, that he is the stolen prince of his daydreams, believing that he is in fact dreaming. Flower-in-the-Night, who has never seen a man other than her father, first believes that Abdullah is a woman, so Abdullah agrees to return the next night with portraits of many men so that she can make a proper comparison. He does so, and Abdullah and Flower-in-the-Night decide get married. Abdullah returns the next night, but he arrives just as Flower-in-the-Night is snatched away by a huge flying djinn. Soon after, the Sultan of Zanzib captures Abdullah who then discovers that Flower is actually the Sultan's daughter. Enraged that his daughter is missing, the Sultan blames Abdullah and throws him in jail, threatening to impale him on a 40 foot pole if his daughter is not found. Fortunately, Abdullah is saved by his magic carpet and escapes from Zanzib.
