Veronica Fisher (Judy Garland) enters Oberkugen's music shop, looking for work. Although Otto Oberkugen (S. Z. Sakall) is reluctant to take on more staff, she wins a job by persuading a wealthy matron, through her singing and musical expertise, to buy a harp at almost $25 over Oberkugen's list price. Neither she nor Andrew Larkin (Van Johnson), the shop's senior salesman, suspects that they are each other's anonymous pen pal. They bicker constantly at work despite becoming increasingly attracted to each other.