F. Van Wyck Mason (1901-1978) was an American historian and novelist. He had a long and prolific career as a writer spanning 50 years and including 65 published novels. Few today realize that he wrote for the pulp magazines of the early 20th century, in a variety of genres. This science fiction novel appeared in the pulp magazine Astounding Stories (under the byline F.V.W. Mason ) in 1931. Mason's vivid characterization and exciting action, typical of his later best-selling mystery and historical novels, are evident here as well.