控方证人

威尔弗里德（拉尔夫·理查德森 Ralph Richardson 饰）是伦敦知名的辩护律师，最近因为心脏出现了问题，而被迫留在家中卧床修养。某日，律师梅林带来了一位名叫沃尔的委托人，沃尔遇到了大麻烦，希望法力无边的威尔弗里德能够帮助他，这让无聊的快要发霉的威尔弗里德顿时来了精神。 　　原来，威尔结识了一位非常富有的女人，这位女士十分欣赏威尔弗里德的才华，甚至在自己的遗嘱上写下了威尔弗里德的名字。然而，之后没多久，这位女士就惨遭杀害，即将继承她的遗产的威尔弗里德自然成为了警方头号怀疑的对象。唯一能够证明威尔弗里德清白的，是他的糟糠之妻克里斯汀。Efficient, but bitter and stubborn, barrister Sir Wilfrid Robarts returns to his office in London, having recovered from a heart attack. He is subsequently invited to defend Leonard Stephen Vole, who is the prime suspect in a murder case. Leonard is a former soldier that fought in World War II and is married to his beloved German wife Christine Helm Vole. He is unemployed and accused of seducing and murdering the wealthy middle-aged single woman, Emily French, to inherit 80,000 pounds.