When a woman returns to her childhood home on a remote Swedish island, an arson attack forces the reopening of a decades-old disappearance that left her family vanished and her an orphan. Detective Patrik Hedstrom leads the investigation into the present-day violence, while his wife, Erica Falck, probes the historical mystery of the 1974 disappearance. The narrative alternates between the current investigation and the haunting echoes of the past, as the couple navigates the insular, suspicious atmosphere of the island community. They face a calculated adversary determined to protect long-hidden secrets, placing their own safety at risk as they uncover evidence beneath the floorboards of the family home.

This novel is widely recognized as a staple of the Nordic Noir genre, praised for its ability to weave complex family histories into modern police investigations. Readers often note the effective contrast between the idyllic island setting and the dark, buried secrets that define the plot. The collaboration between the two protagonists, Patrik and Erica, provides a consistent anchor for the series, allowing for a blend of professional deduction and personal inquiry. The work is frequently cited for its methodical pacing and the author's skill in maintaining suspense across multiple timelines.