An asteroid almost destroys life on earth, erasing technology overnight. The few survivors must adapt to survive a harsh new world, and they do. As the planet heals over millions of years, humanity's descendants evolve into three distinct species.

The erdwons are plains people, sprinters with cheetah-like legs and long tails for counterbalance. The skywons are flyers, split into the feudal dayflyers and the reclusive nightflyers. As for the feshwons, they returned to the water.

Three separate human species, each with its own culture, religious beliefs, and internal politics,...