1x3 - Camilla Läckberg's The Fjällbacka Murders

On a crystal clear, starry winter night a young woman dressed in a traditional Lucia gown is seen running across the ice. When she reaches an unfrozen channel, she drops her crown of candles in the snow and throws herself into the dark waters. As Erica investigates the case, she discovers the missing Lucia, a secret love affair and a man seeking revenge.