The discovery of a childhood friend's body in a frozen bathtub forces writer Erica Falck to confront the dark secrets hidden beneath the surface of her quiet Swedish hometown. Upon returning to Fjällbacka, Erica finds herself drawn into the investigation of Alex's death, which initially appears to be a suicide but soon reveals signs of foul play. She begins researching a memoir about the victim, a project that quickly evolves into a search for the truth behind the town's facade. Alongside local detective Patrik Hedström, she navigates a web of long-buried resentments and hidden histories that threaten to expose the community's most guarded secrets.

This novel is widely recognized as the foundational work that established the author as a prominent figure in the Nordic Noir genre. The narrative is noted for its ability to balance a traditional police procedural with a deep, character-driven psychological study of a small community. Readers often highlight the effective use of the Swedish landscape to mirror the cold, detached nature of the central mystery. The collaboration between the two protagonists provides a structural anchor that allows the plot to move between personal discovery and official investigation. The work is frequently cited for its methodical pacing and its focus on the domestic secrets that define the lives of its inhabitants.