This series follows country vicar Merrily Watkins, who is one of the few women priests working as an exorcist in the UK. When a grisly murder takes place in her local area, the police come calling for her assistance. 美瑞莉带着女儿来到新的小镇生活，身为代理牧师的她，来到这个陌生环境，一切都需要慢慢适应。 与此同时，在学习如何成为牧师的过程中，她却遇到了令人匪夷所思的事件，诡异的“命案”，莫名的死亡，是狂热教徒的疯狂行径，还是恶魔降临？
