When chorus girl Janet Jones, Vera-Ellen, is late for rehearsal in Edinburgh, Bates, the chauffeur for B. G. Bruno, gives her a lift in Bruno's limousine, triggering talk that she is engaged to the wealthiest man in Scotland. American producer John Frost, her employer, has just had the star of his next show, Frolics to You, walk out on him because of his desperate financial situation. He replaces her with Janet, hoping Bruno's endorsement will help secure backing from creditors, or at least lend his revival some prestige. Janet's dressmaker, Madame Amanda, Barbara Couper, gives her more clothes, and sends the bill to Bruno. Janet's roommate, Mae Thompson, Diane Hart, convinces her to continue the deception.
When Bruno receives the bill, he goes to the theatre to investigate. Janet mistakes him for reporter Paul Tracy, who was supposed to interview her. Finding Janet very attractive, Bruno does not correct her error. The two fall in love, and Bruno, David Niven, amuses himself by continually asking Janet about her relationship with the supposed millionaire. The dynamic between the two creates a mix of charm and comic tension as the deception deepens. Janet steadys the illusion by staying in Bruno's orbit, while Frost weighs his options and the mounting pressure from impatient creditors.
Bruno eventually gives Frost a cheque for £10,000, a moment that seems to vindicate the ruse. Janet, learning of the payment, confesses everything, but the deception has taken on a life of its own. On the opening night of Frolics to You, Bruno takes a box seat, hoping to enjoy the success while avoiding any scandal. Frost summons the police to have Bruno arrested as an impostor, a move that turns the night into a hectic farce. Between performances, Janet tries to keep Paul Tracy hidden or away from the spotlight, while the unspoken tension between her and Bruno deepens into genuine affection.
During the chaos, Janet blurts out that she loves him, a confession that complicates the schemes of Frost and the expectations of the audience. The police close in as the inspector in charge interrogates Bruno, and in a surprising turn, recognizes him, which validates Bruno in the eyes of Janet and Frost. The revelation brings a resolution where truth and affection triumph over the initial deception, and the story ends on a note of reconciliation and good humor. Throughout the whirlwind of schemes, alibis, and mistaken identities, the movie balances lighthearted romance with a sense of theatrical insistence on authenticity, leaving Janet and Bruno to navigate the aftermath together, with the community’s curiosity satisfied and their romance proven real.