Nia Rivers returns for another adventure...and this time, it might just be her last. For much of her life, Nia has uncovered, recorded, and tried to stop the genocide of humans. But now the tables are turned, and death is rushing to meet her. In order to stop it, Nia must uncover clues to the garden where her kind are fabled to come from before two more of them meet the end of their immortality. The clues she finds leads her into the rainforests of Central America. In the heart of the modern Mayan world, she'll reunite with the Balam, jaguar shifters whose ancestry may hold the key to getting into the underworld of the gods. With the Balam queens at her side, Nia travels through the midwest of Native American tribal lands where the doorway to her ancestral home may lie just below the surface of the Serpent Mound. There the Mohegan, the wolf shifters of the north, are not the only ones who stand in her way. Someone is destroying ancient mounds and blocking her path to the underworld. As time runs out, Nia must find a way into the underworld or another of her kind will die. And this time, that person could be her...