As a heavy mist rolls into the Swedish coastal town of Fjällbacka, shocking violence shakes the small community to its core. Rolf Stenklo, a famous photographer, is found murdered in his gallery. Two days later, a brutal tragedy on a private island leaves the prestigious Bauer family devastated. With his boss acting strangely, Detective Patrik Hedström is left to lead the investigation. Tensions rise threatening cracks in the team of officers at Tanumshede police station and pressure mounts as the press demand answers. In pursuit of inspiration for her next true-crime book, Patrik's wife Erica Falck leaves behind their three children and travels to Stockholm to research the unsolved decades-old murder of a figure from Rolf's past. As Erica searches for the truth, she realizes that her mystery is connected to Patrik's case. These threads from the past are woven into the present and old sins leave behind long shadows.