The Dry, Jane Harper

"Who really killed the Hadler family? Luke Hadler turns a gun on his wife and child, then himself. The farming community of Kiewarra is facing life and death choices daily. If one of their own broke under the strain, well ... When Federal Police investigator Aaron Falk returns to Kiewarra for the funerals, he is loath to confront the people who rejected him twenty years earlier. But when his investigative skills are called on, the facts of the Hadler case start to make him doubt this murder-suicide charge. And as Falk probes deeper into the killings, old wounds are reopened. For Falk and his childhood friend Luke shared a secret ... A secret Falk thought long-buried ... A secret which Luke's death starts to bring to the surface ..." --