The First Rule by Robert Crais

In this gripping thriller, a former military operative turned private investigator is thrust into a dangerous world of organized crime and betrayal when a close friend and his family are brutally murdered. As he delves deeper into the investigation, he uncovers a web of deceit involving a ruthless Serbian gang and a deadly conspiracy that threatens to destroy everything he holds dear. With relentless determination and a keen sense of justice, he navigates the treacherous underworld, confronting his own demons while racing against time to uncover the truth and avenge his friend's death.