夏日里，在一个英国的度假小镇上。一具年轻女子的尸体躺在沙滩上。谁杀了她?是那晚在迪斯科舞厅遇见她并和她跳舞的那两个年轻人西蒙和丹吗?他们有时会偷车，可他们是杀人犯吗?

那晚在迪斯科舞厅到底发生了什么?有目击者说当时有人打架。玛丽走的时候是谁跟着她?她是一个人吗?那玛丽的男朋友吉姆呢?他真的爱她吗?或许他有点儿嫉妒和生气……

法庭需要找到所有这些问题的答案，因为谋杀是重罪，杀人犯往往要被终身监禁。

It is summer time in an English holiday town. A young girl lies dead on the beach. Who killed her? Was it Simon and Dan, the two young men who met her, and danced with her, at the disco that night? They sometimes steal cars, but are they guilty of murder?

What really happened that night at the disco? There are witnesses who say that there was a fight. Who followed Mary when she left? Was she alone? And what about Mary's boyfriend, Jim? Did he really love her? Perhaps he was a little jealous, and angry...

The court needs to find answers to all these questions, because murder is a very serious crime, and murderers are often sent to prison for life.