久利奥，一个搞着自己论文的电影系学生，在他不忙于观看德国表现主义作品或经典恐怖影片时，在当地音像店度过大部分时间。在店里的一天晚上他与住在自己公寓外街道另一边的萨沙相识。而第二天，萨沙的母亲被发现死亡。久利奥确信谋杀的实施从阿尔弗雷德.希区柯克的影片中得到启发，于是违背女朋友的忠告，决定开始他自己的调查...In 1990, as a boy, Giulio was chased through the woods by two women after spying on them practicing witchcraft. Now a young film student in Turin, he watches his neighbors in the flats across from his third floor apartment, especially Sasha when she's naked or arguing with her mother. Giulio's girlfriend is disgusted with his voyeurism, but, after a murder occurs, Giulio is convinced that two relative strangers, just as in Hitchcock and Highsmith's "Strangers in a Train," have agreed to murder each other's bête noir. He follows his suspects, ends up with an intruder and a broken foot, and may be in real danger. Is he more than a peeping Tom?