At an elite boarding school for girls, six friends jokingly engage in a late night ritual, calling forth the spirit of a dead former student who reportedly haunts their halls. Before morning, one of the girls is dead, leaving the others wondering what they may have awakened.

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?

When David, Juliet, and Alex are searching for a fourth roommate for their flat, they settle on the aloof Hugo. However, they soon find Hugo dead, with a large sum of cash being among his belongings. The three friends decide to keep the money, dismembering and burying Hugo's body. However, their newfound fortune begins to corrode their friendships, with each roommate resorting to manipulation tactics to scam the others out of the money.

When Erica finds Fjällbacka's photographer Stigge murdered in his studio, she can't help but take interest in the investigation regarding his death. Patrik and his colleagues at the Fjällbacka police soon starts to question whether or not Stigge was the sweet old man he seemed to be. Erica is already ahead of them - since her mother-in-law Kristina has confided in her that she is one among many in the neighborhood that Stigge blackmailed... In "The sea gives, the sea takes" we go back to the 1960s to tell the story of how true love corrupted young Stigge and made him cover up a murder with the purpose to win the love of his life.

Erica's parents are killed in a traffic accident. She moves to Fjällbacka and discovers she has a brother.

Erica's sister Anna is visiting at the same time as the TV program "Antiques cubed" is in town to record at the castle in Fjällbacka. When Anna runs into the TV host for the show, Claes Wager, sparks quickly evolve into a flirt between the two of them. During preparation at the castle Anna is the one to find Linda Hamrin unconscious from an overdose of medicine. Both Erica and Patrik are dragged into the case when only a day later a man, Hasse Wennerman, is killed and the rumors of an affair that led to Linda's overdose spiral up into a big conflict. The old painting, Hasse Wennerman brought to the antique show, is also missing and when it is found among Annas belongings, Erica gets a hard time trying to prove her sisters innocence

The successful detective writer, Erica Falck, is thinking that her next book should be based on a true mysterious event from her childhood. When she was only 13 years old one of her dear friends and classmate Peter boarded a bus and then disappeared. Erica has been unable to let go of the tragic event and her first meeting with a real mystery. As she starts digging deeper into what really happened to Peter it seems as if she has awakened a sleeping beast. When Erica's only connection to Peter, his brother Ivan, who is on his way to see her, gets stabbed and murdered her mission becomes not only to solve the mystery about Peter but also to find out who killed Ivan. During a high school reunion party the heat builds up when Tina, Peter and Ivan's enigmatic sister, unexpectedly shows up and later at the party another murder is committed that leads Erica closer to the truth about what actually happened to the missing Peter.

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.