A rich woman, Raffaella, and some friends rent a yacht to sail the Mediterranean Sea during summer. The sailor, Gennarino, who is a communist, does not like this woman but has to bear with her bad mood. One day she wakes up late in the afternoon and asks to be taken to land where everyone had gone earlier. Gennarino se…

故事报告的是年轻的已婚女子Roberta深夜开车回家，不幸不测撞见一宗残忍的谋杀案，一位金发女子临死前刚巧倒在她的车前。当Roberta为了隐匿残忍的凶手而逃脱并寻求援助报警今后，回到案发明场时，却发明凶手和死者的尸身都不见了。警方甚至连血迹都无从获取，不由思疑起Roberta的精力是否正常，更可骇的是那名凶手恍如也盯上了Roberta，…