The Darkest Room by Johan Theorin

Joakim Westin recently moved to Eel Point on the Swedish isle of Oland with his wife and two young children. Eel Point is an isolated estate (a manor house adjacent to two lighthouses) at which there have been a number of unfortunate deaths since the mid-1800's. When Joakim's wife, Katrine, is found drowned, he wonders if it was suicide or murder. Joakim also feels that Katrine is still around as a ghostly spirit. Meanwhile, three men are robbing houses all over the island and set their sights on Eel Point. Newly arrived policewoman Tilda Davidsson tries to find out who's responsible for the stealing, at the same time thinking that Katrine might have been the object of foul play. The Darkest Room follows these three storylines, as well as those of the past inhabitants of Eel Point, to create a mystery that slowly picks up speed as the threads intersect. Patient readers will be rewarded with an unputdownable ending. The novel is a sequel to Theorin's first book, Echoes of the Dead.