Kingdom of Cages — Sarah Zettel

A gripping story of two young sisters caught in a galactic apocalypse...

FUGITIVES IN A CLOSED SYSTEM

Chena and Teal Trust are in mortal danger. Humans on dozens of colony planets are dying from environmental collapses and mutating diseases. Their warships orbit the lush world of Pandora with an ultimatum: The brilliant ecologists of Pandora must solve the crisis, or their paradise will be destroyed. Now Chena and Teal are chosen to immigrate as part of Pandora's "Eden Project." But once they arrive, the Trusts quickly learn that the scientists don't want new blood...only raw DNA. Trapped on a world where nature is genetically programmed to kill, the girls' new lives may be very short, unless they can discover whether the Pandorans are seeking a universal cure -- or a means to commit galaxy-spanning genocide.