In the stifling jungles of a small South American country, Robert Clay works as a civil engineer at a mine. But he also has a secret history as a mercenary, fighting for whichever side will pay him most. Clay finds himself in love with Alice Langham, the daughter of the wealthy American owner of the mine. His rival is Reggie King, also from a powerful family. Together, these characters find themselves at the center of a violent revolution.

First edition of his most financially successful book. Six full-page illustrations including the frontispiece by C. D. Gibson and with full-length "Gibson Girl" on front cover. Dark yellow cloth stamped in dark blue and gilt on front and dark blue on spine.