Amara, who once suffered from "episodes" dismissed as mental illness, discovers these aren't hallucinations but glimpses across time. With guidance from Baba Ade, an ancient mystic, Amara learns she and Nkem are "Watchers" - guardians who perceive patterns across cycles of time. They confront entities called the "Whispering Black" that feed on souls and threaten to collapse the entire spiral of time itself. Amara and Nkem perform a ritual at an abandoned lighthouse to restore boundaries between realms. They later work with Baba Ade to document the "Fold" - the recurring cycle of time - while seeking other Watchers.