Abby (Chloe Moretz), a mysterious 12-year-old who moves next door to Owen (Kodi Smit-McPhee), a social outcast who is viciously bullied at school. In his loneliness, Owen forms a profound bond with his new neighbor, but he can’t help noticing that Abby is like no one he has ever met before. As a string of grisly murders grips his wintry New Mexico town, Owen has to confront the reality that this seemingly innocent girl is actually a savage vampire.

在一個時常為白雪覆蓋的小鎮，有一幢昏黃孤寂的公寓，少年歐文（科迪斯密特•麥菲飾）和離異的母親居住於此。這個清秀的小男孩敏感怯懦，在學校時常受到別人的欺負，媽媽則篤信宗教，無暇他顧。歐文只能躲在自己的小房間，通過望遠鏡窺視外邊的世界，或者扮作連環殺人狂，釋放心中的壓抑與憤怒。某個夜晚，美麗而神秘的可人艾比（科洛•莫瑞茲飾）搬入公寓，成為歐文的鄰居。這兩個共同擁有獨特氣質的孩子相互吸引，漸漸成為了好朋友。與此同時，小鎮上兇殺案件接連發生，歐文也無意中發現艾比身上令人難以置信的秘密…。