Midsummer Eve 1973, Annie and her daughter Mia are on their way to the isolated Stjärnberg collective to start a new life with her boyfriend Dan. On the way there, she finds two people murdered in a tent. That same evening, Johan runs away from home and gets a ride with a mysterious woman. Almost 20 years later, in 1991, the tent murders at Lobberån still affect the people in Svartvattnet. Annie calls Birger in the middle of the night, when Mia comes home late in the company of a man whom Mia recognizes from before.

Annie and Mia try to settle in the collective, but Annie is tormented by thoughts of the murders. When Birger is drawn into the murder investigation, it affects both marriages and friendships. In 1991, Annie is found dead in Lobberån, but the cause of death puzzles Birger and Mia.