A group of ivory-tower lexicographers realize they need to hear how real people talk, and end up helping a beautiful singer escape from the Mob.

乡绅沃辛（Michael Redgrave 饰）来到伦敦城内拜访阿尔及（Michael Denison 饰），而实际目的是后者的表妹格温多兰，为了便于探望格温多兰，沃辛虚构了一位伦敦的不肖昆仲欧内斯特。阿尔及对沃辛在乡下监护的姑娘西西莉情有独钟，于是出…