Beyond the Truth by Anne Holt

Shortly before Christmas, Hanne Wilhelmsen, Chief Inspector of the Norwegian Police, is called to the scene of multiple murders. Four people are found shot dead at the home of the wealthy Stahlberg family. Three of the dead are members of the family, and the fourth victim is an undistinguished author, seemingly out of place. As Hanne and her long-time police partner, Billy T., investigate, they unearth many motives for the murders; each surviving member of the Stahlberg family had good reason to want the victims dead. As Hanne draws closer to the truth, she will once again risk everything for justice. But this time, will she pay the ultimate price?