As a young boy, Fredrik Fröding survived one of Europe’s worst ferry disasters – M/S Estonia in 1994. The sunken ship takes both his parents down in the sea. His brother Niklas is washed aboard from the rescue raft while Fredrik holds his hand, and to this day he refuses to give up hope that his brother survived.

Twenty-five years later Fredrik sees his brother outside a hotel in Stockholm, together with the owner Adam Ceder. In a search to find Niklas, Fredrik follows Ceder to the island Ulvön to confront him, but before he has time to do so Ceder is found brutally murdered. Surprisingly, the investigation is lead by a person from Fredrik’s past, police officer Sofia Hjortén. Sofia moved back to her family home on the island after a quick rise within the Stockholm police, to heal from a tragedy that still haunts her. She is determined to start a new life and when Fredrik becomes a suspect for the Ceder murder she is the only one who believes his innocence.