Joe Pickett has come to learn that a drone is killing wildlife --- and it belongs to a mysterious and wealthy man whose son is dating Joe's own daughter, Lucy. When Joe tries to lay down the rules for the drone operator, he's asked by the FBI and the DOJ to stand down, which only makes him more suspicious. Meanwhile, bodies are piling up in and around Joe's district in shocking numbers. He begins to fear that a pack of four vicious killers working on behalf of the Sinaloa cartel known as the Wolf Pack has arrived. Their target seems to be the mystery man and everyone --- including Joe, Nate and others --- who is associated with him.