Wyoming game warden Joe Pickett confronts drug cartel killers hunting on his turf. A drone is killing wildlife, and it belongs to a mysterious and wealthy man whose grandson is dating Joe's own daughter, Lucy. But when Joe tries to lay down the rules for the drone operator, he is asked by the FBI and the DOJ to back off as the man is in the witness relocation program and he's being hunted by four killers from the Sinaloa cartel. A top ten NY Times bestseller.