Flora Hansen makes her living masquerading as a medium. Yet when a young woman is brutally murdered at a rural home for wayward girls, she begins to suffer visions that are all too real. She calls the police, claiming to have seen a ghost, but Detective Inspector Joona Linna is the only one who listens. The case seems obvious to everyone: Another girl fled the home on the night of the killing and left behind a bloody hammer under her pillow. But Hansen insists that the murder weapon was, in fact, a stone. Linna refuses to accept the easy answers, and his search leads him into darker, more violent territory―and to a shocking confrontation with a figure from his past.