The Mountain King by Anders de la Motte

This atmospheric and sinister mystery, perfect for fans of the Nordic thrillers of Jo Nesbo and Stieg Larsson, follows an overachieving female inspector investigating the darkest side of humanity, from "one of Sweden's most talented crime fiction authors" (Erik Axl Sund, author of The Crow Girl).
Criminal inspector Leonore Asker seems to have the leading position at Malmö's Major Crime Division within reach. But things go awry when, in the middle of a high-profile kidnapping case, management relegates her to the so-called Department of Lost Souls—the unit for odd, cold cases banished to the basement of the police station.

Despite the humiliation, Asker is drawn into one of the more peculiar cases. Someone is placing small ominous figures in town and one of them seems to represent the missing woman from the kidnapping case. As Asker's investigation takes her to abandoned buildings, she reaches out to a local architecture expert and together they explore the sinister recesses of the city and discover that an unusual kind of evil lurks in the shadows.