Lucy is preparing to go on vacation, but she has a change of heart when her substitute secretary turns out to be an attractive blonde who Mr. Mooney really likes. Lucy secretly doesn't go on vacation, and spies on them in various disguises.

Mr. Cheever warns Mr. Mooney that his job is in jeopardy unless he attracts new business to their branch of the bank. So when Lucy hears that a recording star, country hick Homer Higgins (Ernie Ford), is about to become a California resident, she sets off to the hotel to coax him into setting up an account with their bank. To impress Mr. Higgins and his family, Lucy and Mr. Mooney set up a hoe-down in the bank after it closes that evening...and Lucy decides to dress down to pose as Mrs. Mooney.

Lucy fakes sickness to go shopping at a one-day-only sale with Mary Jane. But when Lucy becomes the customer of the year and has her photo printed in the paper, Lucy must hide the paper from Mr. Mooney before he sees it.

Whe famous French movie star Jacques DuPre expresses interest in opening an account at Mr. Mooney's bank, Lucy is asked to visit his apartment and dictate a formal letter of agreement confirming the account. While visiting, she drinks a little too much champagne and makes a complete fool of herself. But Monsieur DuPre gets a kick out of it, and gets the account anyway.

Mr. Cheever's wisecracking nephew, Tommy (Frankie Avalon), comes to work at the bank, to discourage him from the position he really wants – a job in show business. Despite the fact that he's to get no special treatment, Mooney repeatedly sucks up to him. Lucy soon befriends the young Cheever, who impresses her with a song and dance. So Lucy sets out to break Tommy into show biz...

Needing new accounts for the bank, Lucy visits Jack Benny to try and get him to keep his money at her bank. He agrees to do it if she can prove that her bank can build a vault safer than his. Lucy then has the bank build a burglar proof vault, and gives Mr. Benny a personal tour of it.

Lucy and Mr. Mooney are sent to pick up Mr. Heatherington, the wealthy bank president, from the airport, and the gentleman finds that Lucy strikes his fancy. So when Mr. Mooney neglects to find a lady for Mr. Heatherington to escort to that evening's banquet, Lucy is given the job. But to her dismay, she's forced to dress up as a little old lady. As it turn's out, little old Lucy strikes perverse Mr. Heatherington's fancy more than the younger Lucy...

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When Mr. Mooney is up for becoming president of the San Fransisco branch of the bank, Lucy tries to get him named Boss of the Year so he gets the position.