Following the defeat of the Martian invasion of Britain, a new threat to humanity lands in the American west. President Roosevelt musters the captains of industry and leading scientists to find a way to turn back the Martian tide

After the failure of their first scouting expedition to England in 1900, the Martians regrouped, developed means to deal with the deadly Earthly microorganisms, and landed again in 1908. Not just in one location, but all over the world. Their transport cylinders fell on every continent and in great number. Only England and Europe were spared this time.The first three books in the Great Martian War series dealt with the invasion in America. The Gathering Storm expands the narrative to Australia, Africa, and the Near East. The year is 1912 and the Martians have planned a vast coordinated offensive to link up their scattered conquests and assemble a force so powerful that nothing can resist it.

The Martian invaders have overrun the American heartland. Between the Mississippi and the Rockies, only Texas holds out, written off by the high command in Washington, and with revolution brewing in Mexico. Texas has become the Martians' new target. Across the Lone Star State, soldiers, Rangers, and civilians alike prepare to repel the next attack, outmatched and outgunned – yet undaunted. Governor Colquitt and General Funston plan to build their own weapons, raise their own armies, and perhaps take the war into their own hands. But the Martians may not be their only concern...

Originally published: London: Gollancz, 2017.

H.G. Wells, his fiancee Jane, and T.H. Huxley agree to participate in the secret super-science work of Britain's Imperial Institute. Accidentally propelled into space, the trio hear of the Martians' earlier enslavement of the hive-mind Selenites from their leader, the Grand Lunar. Proceeding to Mars, they trigger a revolt among the Selenites and learn of the Martian's invasion plans for Earth.

The War of the Worlds (1898), by H. G. Wells, is an early science fiction novel which describes an invasion of England by aliens from Mars. It is one of the earliest and best-known depictions of an alien invasion of Earth, and has influenced many others, as well as spawning several films, radio dramas, comic book adaptations, and a television series based on the story. The 1938 radio broadcast caused public outcry against the episode, as many listeners believed that an actual Martian invasion was in progress, a notable example of mass hysteria.

The tranquility of Mars is disrupted by humans who want to conquer space, colonize the planet, and escape a doomed Earth.