A fairy tale in the traditional framework about a fairy changling and her vacillations between real and magic worlds. Rosemary, a mortal as it was believed, was brought to fairyland as a servant and a Cinderella drudge. It was not until she wandered to earth and not her twin that the question of her origin arose. Rosemary is a fairy after all, and returns with a mysterious young man with a green hat and red feather -- who of course is the fairy prince. A lived-happily-ever-after story with enough witty characterizations to offset the antiquated pattern.