On the Red Planet, Darvel runs afoul of hostile, bat-winged, blood-sucking natives, a once-powerful civilization now ruled by the Great Brain.
Le Rouge's Mars is elaborately described, with its fauna, flora and various races of inhabitants, à la C. S. Lewis' Out of the Silent Planet (1938).
Planetary romance blends with "cosmic horror" as the characters switch from swashbuckling he-men to helpless bundles of gibbering terror.
In 1907, Le Rouge first made the acquaintance of the Swiss poet Blaise Cendrars, who later painted an affectionately colorful portrait of him in his memoir L’homme foudroyé (1945).
The Red Hand's growing, global, evil influence eventually causes the creation of an alliance of heroes, led by Dr. Prosper Bondonnat, billionaire William Dorgan and Lord Burydan, who band together to fight and, ultimately, defeat them.