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After climate apocolypse, an ambitious private foundation launched a starship to find a new world for colonization.

The starship Aeon sought a planet with a large moon to ensure Earthlike tides and seasons. Aeon finally found a new world with an apparently primitive ecosystem and a huge ocean moon covered with hurricanes.

Then the season of crisis began.

Human genes had been insidiously damaged by the cryostasis—cold suspended animation—that went on too long. Astronaut-physician Catharin Gault and molecular biologist Joseph Devreze had to cooperate with each other as they learned how to repair the genome. Soon they and everyone else collided with their greatest hopes and worst fears, their understandings of love or of theology—and, in some cases, with the past they thought they’d left behind on Earth. Finally, though, they all knew that the colonization of Planet Green could succeed.

Downfall Tide begins twenty-four years after the events in Hurricane Moon. Much has changed, thanks to unremitting hard work by Catharin and Joe and the others in the first generation of colonists. They’ve founded a new civilization on Planet Green. They’ve begun to understand Green’s deceptively simple-looking ecosystem. To better understand the huge blue moon and the rest of the solar system, the starship Aeon is taking its last journey of exploration, to the outer planets.

And then a brilliant, strange new star appears in the evening sky of Planet Green.

It signals the beginning’s end.