Rex is seven foot tall at the shoulder, bulletproof, bristling with heavy calibre weaponry and his voice resonates with subsonics especially designed to instil fear. He's part of a Multiform Assault Pack operating in the lawless anarchy of Campeche, Mexico. As a genetically engineered Bioform, Rex is a dealy weapon in a dirty war. But all he wants to be is a Good Dog. And to do that he must do exactly what Master says and kill a lot of enemies. But who, exactly, are the enemies? What happens when Master is tried as a war criminal? What rights does the Geneva Convention grant weapons? Do Rex and his fellow Bioforms even have a right to exist? And what happens when Rex slips his leash?