A young couple become engaged, but enjoy a number of comedic aventures before their wedding day.

Two wealthy Victorian widows are courted tentatively by two impoverished British aristocrats. When one of the dowagers suggests that her beau go away with her for a month to see if they are compatible, the fireworks begin.

Poor New York shop girl Nadina receives the unexpected news that she is next in line to be queen of an Eastern European country. On her arrival in Ruritania, a revolution is in progress, and only minutes before her coronation, Nadina is forced into exile. She flees to Paris with her nurse, and then travels on to Switzerland. There Nadina encounters the Ruritanian revolutionary leader Carl, recuperating from the trials of revolution, and the couple unexpectedly fall in love. When the revolution collapses in Ruritania, they return and marry, thus forming a constitutional monarchy supported by all the people.

二战初期，丹麦商船 “海尔维格号” 船长安徒生（康拉德・韦特饰）因英国港口管制滞留伦敦。他在码头邂逅自称索伦森夫人（瓦莱丽・霍布森饰）的神秘女子，对方以寻找失踪丈夫为由，请求安徒生协助。
两人卷入一场德国间谍阴谋：间谍头目范戴恩（雷蒙德・洛威尔饰）企图窃取英国海军机密，索伦森夫人实为英国情报人员，正卧底调查。安徒生凭借机智与勇气，与船员、英国特工联手，在伦敦的夜总会、码头与间谍展开周旋，最终挫败间谍计划，救出索伦森夫人。
故事融合悬疑、动作与浪漫，以轻松幽默的笔触展现战时伦敦的紧张氛围，安徒生从普通船长转变为反间谍英雄，成为影片亮点。