一群时髦的朋友聚集在一座哥特式城堡里，城堡的主人是一个坐轮椅的女孩的老亲戚。这群人中的一对夫妇，在其他人不知情的情况下，正在走私一些中国文物中的海洛因，主人公从东方带回来送给她年迈的亲戚。与此同时，主人公精神错乱的叔叔，据说杀死了主人公的母亲（他自己的妹妹）并割掉了她的眼睛，正在地下墓穴里徘徊，监视着每个人。当其中一个客人被谋杀，她的眼睛随后消失，怀疑自然落在疯狂的叔叔。但他是被陷害的吗？

A group of hip friends gather at a Gothic castle owned by a wheelchair- bound older relative of one of the girls. One couple in the group, unbeknownst to the others, is smuggling heroin in some Chinese artifacts the protagonist has brought back from the Orient to give to her elderly relative. Meanwhile the deranged uncle of the protagonist, who supposedly killed the protagonist's mother (his own sister) and cut out her eyes, is wandering the catacombs spying on everyone. When one of the guests is murdered and her eyes subsequently disappear, suspicion naturally falls on the mad uncle. But is he being set up?

In un vecchio castello una perversa domestica semina cadaveri, cercando di fare ricadere la colpa sul figlio, tarato, dei suoi padroni. Un bravo commissario riuscirà a smascherarla.