音乐厅中传来枪声，观众们壹片惊慌。壹位外国女子（露西•曼娜海姆表演）询问理查德•汉内（罗伯特•多纳特表演）是否可以在他家中过夜。次日该女子在被杀之前告诉理查德必须阻止间谍组织“叁拾玖级台阶”将国家机密偷偷送出日不落。汉内为了证明自己并不是杀秂凶手无奈前往苏格兰高地寻找线索，在火车上他寻求壹位叫做帕梅拉（玛德琳•卡罗尔表演）的金发年轻女子帮助，但她却马上向警察告发了他。他找到了“叁拾玖级台阶”的领导...

In a small Scottish village, horribly murdered bodies keep turning up. Suspicion falls upon the residents of a nearby castle that is haunted by a curse involving a killer cat....

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In a small Scottish village, horribly murdered bodies keep turning up. Suspicion falls upon the residents of a nearby castle that is haunted by a curse involving a killer cat....