Heinlein, the dean of American SF writers, also wrote fantasy fiction throughout his long career. The Golden Age of SF was also the time of a revolution in fantasy fiction, and Heinlein was part of it with stories set in a convincingly realistic world such as Magic, Inc., They, and The Unpleasant Profession of Jonathan Hoag. Now, all the short stories and novellas that Heinlein himself considered fantasies have been collected in one big volume for the first time.