Tobias is in the middle of his life, works at an art museum, divorced and living with his 16-year-old daughter. His ex-wife is struggling with her new life, his brother is looking for excitement in life by being unfaithful and his daughter longs to move away from home. Close to Tobias are also the beautiful journalist Liv and the straightforward primary school teacher Graci.
The young coast guard and diver Jessica finds two dead scuba divers after a storm. She disagrees with her superiors that it was an accident and seeks the help of her childhood friend Patrik. Patrik and Erica, who are on their way to a romantic holiday, make a detour to the beautiful village of Kungshamn. They soon become involved in the case. Erica hides her real identity as the policemans wife and is invited to join the museum association. Already during the first meeting she attends the associations chairman is found murdered... The three deaths are now officially opened for investigation, and the common denominator between the victims seems to have been an interest in the wreckage of a 1820s ship. Did somebody finally find it? And what cargo did it carry? What caused the ship to sink?
On a crystal clear, starry and bitingly cold winter night a young woman dressed in the traditional Lucia white gown is seen running across the ice while sobbing. She stumbles in her long gown and drops her crown of candles in the snow and when she reaches a channel in the ice she throws herself into the dark waters and disappears. We find Erica and her husband Patrik right in the middle of preparing everything to celebrate Christmas in their house for the first time. On the 13th of December the family goes to church to watch the Lucia celebration only to find out that the Lucia has gone missing. Erica who notices a dispute in the audience can't help herself but to try and find out what the fight was really about and what could have happened to the missing Lucia. The past catches up with the present as Erica's discoveries leads to the missing Lucia, a secret love affair and a son seeking revenge for his mother.
