故事发生在1910年的伦敦，班克斯先生（David Tomlinson 饰）是一名银行职员，而班克斯太太（格莱妮丝·约翰斯 Glynis Johns 饰）则醉心于女权运动，公务缠身的两人顾不上照料膝下的一双儿女麦克（Matthew Garber 饰）和珍妮（Karen Dotrice 饰），只有请保姆代劳，可是，夫妻两人并不知道的是，古灵精怪的兄妹两，哪里是普通的保姆能够招架的了的！
　　一位名叫玛丽（朱丽·安德鲁斯 Julie Andrews 饰）漂亮姑娘来到了班克斯家应聘保姆的职位，她刚刚出场就令麦克和珍妮留下了深刻的印象。原来，玛丽是一位仙女，她的到来让两个孩子重新感受到了亲情和友情，亦让班克斯先生和太太明白了什么才是生命中最终要的东西。

　　Roger Willoughby is considered to be a leading expert on sports fishing. He's written books on the subject and is loved by his customers in the sporting goods department at Abercrombie and Fitch, where he works. There's only one problem however: he's never been fishing in his life. When the store owner enters him in a fishing contest, mayhem ensues.