#5 and final adventure in the fantasy adventures of Carson Napier on the planet Venus. It has everything from a damsel in distress, to thought-transference, to a mad despot, to an Earthman who saves the day! It is also an unfinished Burroughs story. Carson, 27 years old, is a rich, handsome blond haired, blue eyed man has the idea of exploring Mars. He builds a rocket to do that, but because he fails to consider the moon's gravity in his calculations, ends up on Venus.
Carson and his companion Ero Shan take off to test Carson's new airplane. Thick fog, even worse than Venus's normal permanent overcast, forces them down in an unknown land with medieval castles. The people are, allegedly, oppressed by a wizard who can turn them into zorats (Venus's strange equivalent of horses). Before they can continue on their way home, Carson and Ero Shan are compelled, as well as obliged, to help out.