禁忌4Series two joins Chris Carson six months later. Chris is attempting to rebuild his life, and his relationships, desperate to avoid the corruption that nearly sucked him under. He is trying to be a better police officer, a better man, and most importantly, a better father to his daughter Tilly. All whilst still dealing with the relentless trauma of being a night response officer. Chris wants a day job. Chris needs a day job. But is he prepared to risk everything to get one?