讲述亚瑟王在结束与罗马帝国的战争、返回家园后，发现王位被自己的侄子窃取，为了夺回王位，他被迫向巫师梅林和圣杯骑士团寻求帮助。

Dan Hawk, an ex-detective turned writer, is re-instated onto the force after returning to his home town. A serial killer has 'donned the guise'