Amidst the fake smiles and cult-like tendencies on a secluded island, nineteen-year-old Opal Valeis is the epitome of privilege, living a life of indulgence and disregard for the common folk. But when her village declares her as the chosen human sacrifice to appease the Ones Below, Opal's world is upended. Thrown into a dark, bottomless pit as part of a ritually gruesome ceremony, she defies expectations by surviving the fall. At the pit's bottom, Opal discovers a hidden civilization led by god-like creatures. The inhabitants of this subterranean world, once betrayed by the island's ancestors, force Opal into servitude under one of the most wicked beings. This being, with his own vendetta against the surface world, uses Opal as both a pawn and a weapon for his own plan. Trapped between her burning desire for revenge and her growing understanding of the subterranean world's plight, Opal must navigate treacherous alliances and confront her own values. As she uncovers secrets of the true nature of the deity she was sacrificed for, Opal faces a choice: to seek vengeance on her former life or to forge a new path for both worlds.