When Erica finds photographer Stigge murdered in his studio, she can't help but take interest in the investigation. She learns that her mother-in-law, Kristina, was one among many in the neighborhood whom Stigge had blackmailed. With this news, Erica begins to dig even deeper into his past.
A businessman is murdered and Erica's sister was the last person to see him alive. Things get even more complex when Anna confesses that she spent the night with him. As the questions multiply and grow, it's discovered that Anna's common-law husband knew of the affair.
Erica Falck, a successful crime writer and mother of three, moved with her husband and children from the city to her hometown of Fjällbacka, a fishing village on a picturesque island off the coast of Sweden. Her return seems idyllic, but simmering beneath the village's surface lie hidden secrets, twisted desires and deceit waiting to erupt into the ultimate sin - murder.