Darren Shan was just an ordinary schoolboy - until his visit to the Cirque Du Freak.
Now, as he struggles with his new life as a Vampire's Assistant, he tries desperately to resist the one temptation that sickens him, the one thing that can keep him alive.
But destiny is calling... the Wolf Man is waiting.
向達倫從一個普通的學生成了『鬼不理的助手』,跟隨鬼不理先生到處流浪,開始學習吸血鬼世界的一切。但是他很快就厭倦了這樣餐風露宿的日子,更讓向達倫受不了的是他根本沒辦法交朋友,而這一切都是鬼不理害的!
因此鬼不理帶著向達倫回到怪奇馬戲團,向達倫不但正式成為馬戲團的工作人員,還開始和蛇孩兒、普通男孩山姆等人交上朋友。在融入了馬戲團的生活之後,向達倫開始努力工作,但是為了找尋食物餵食可怕的狼人和小矮人,卻引發了怪奇馬戲團最大的危機……
更讓向達倫困擾的是,他得拚命抗拒那個讓他厭惡的誘惑,然而那卻是唯一能讓他活下去的東西。他的身體愈來愈衰弱了,使得一切的狀況也逐漸脫離了掌握……