As climate disasters wreak havoc, a sister and brother take opposing sides on the fate of the human race.
Syrah Carthan wants to save it. A tour guide for the Sequoia National Park, Syrah has an affinity for the millennia-old giants that extends to Rhiza, a subterranean world as ancient as Earth itself. Syrah is the reluctant heir apparent as its Keeper. Her duty is to maintain a balance between nature and humans. But Syrah’s greatest adversary has his duty as well.