"Brilliantly structured . . . with a delicious tension carefully developed among the wonderful characters." —The New York Times Experience this far-reaching, mind-bending science fiction adventure that uses time travel to merge climate fiction with historical fantasy. From Kelly Robson, Aurora Award winner, Campbell, Nebula, and Theodore Sturgeon finalist, and author of Waters of Versailles Discover a shifting history of adventure as humanity clashes over whether to repair their ruined planet or luxuriate in a less tainted past. In 2267, Earth has just begun to recover from worldwide ecological disasters. Minh is part of the generation that first moved back up to the surface of the Earth from the underground hells, to reclaim humanity's ancestral habitat. She's spent her entire life restoring river ecosystems, but lately the kind of long-term restoration projects Minh works on have been stalled due to the invention of time travel. When she gets the opportunity take a team to 2000 BC to survey the Tigris and Euphrates rivers, she jumps at the chance to uncover the secrets of the shadowy think tank that controls time travel technology.