The Dry - Jane Harper

Three members of the Hadler family are brutally murdered. Everyone thinks Luke Hadler, who committed suicide after slaughtering his wife and six-year-old son, is guilty. Policeman Aaron Falk returns to the town of his youth for the funeral of his childhood best friend, and is unwillingly drawn into the investigation. As questions mount and suspicion spreads through the town, Falk is forced to confront the community that rejected him twenty years earlier