Nancy Lea is the Lunarian envoy to Queen Victoria. She and Jacob McCleary come to Earth with a deadly warning from Mon Ilson, the Emperor of Space. At an isolated airfield in the midst of a raging storm, Nancy is cruelly mistaken for the murderous Lady Neva Talbot-Rhys. Nancy is interrogated by the Queen's Agent, the witch Felicity Cressy. To keep her off guard, Felicity employs an unorthodox strategy. She introduces the dashing Captain Jaimee Dalgliesh to the alien in human form. His mission is to seduce Nancy, but can he avoid being seduced in turn?