The disappearance of a young girl from a forest near Fjällbacka triggers a harrowing investigation that forces the community to confront a decades-old tragedy. Detective Patrik Hedström leads the official inquiry into the missing child, while his wife, Erica Falck, pursues her own independent investigation into the historical parallels of the case. As they navigate the insular dynamics of the small Swedish town, they encounter resistance from locals protecting long-held secrets. The narrative weaves together contemporary police work with the dark, lingering influence of historical folklore and past crimes, creating a multi-layered mystery that challenges the protagonists' understanding of justice.

The novel is widely recognized as a staple of the Nordic Noir genre, praised for its ability to balance intricate procedural details with deep psychological character studies. Readers often highlight the author's skill in layering historical trauma over contemporary crime, which creates a distinct sense of dread throughout the narrative. The partnership between Patrik and Erica remains a central draw for the series, providing a stable emotional anchor amidst the increasingly complex and dark plot developments. Critics and fans alike note that the inclusion of local legends adds a unique, haunting dimension to the standard police investigation format.