故事讲述的是年轻的已婚女子Roberta深夜开车回家，不幸意外撞见一宗残忍的谋杀案，一位金发女子临死前恰巧倒在她的车前。当Roberta为了躲避残忍的凶手而逃走并寻求帮助报警之后，回到案发现场时，却发现凶手和死者的尸体都不见了。警方甚至连血迹都无从获得，不禁怀疑起Roberta的精神是否正常，更恐怖的是那名凶手仿佛也盯上了Roberta，准备伺机杀人灭口.......

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 moo...