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Robert Blossom, an over-worked English brassiere manufacturer, spends his spare hours "conducting" great symphony recordings while his neglected wife Harriet busies herself with painting and needlework. One day Harriet's sewing machine breaks down, and Robert sends a factory worker, Ambrose Tuttle, to repair it. Upon discovering that she shares a wildly imaginative fantasy life with Ambrose, Harriet installs him in her attic and conceals his presence from Robert. While Scotland Yard searches for the missing factory worker, Ambrose divides his time between studying a wide variety of self-education books and recreating with Harriet great love stories of the past. As the years pass, Ambrose's newfound talents enable him to transform the attic into a beautifully designed showplace; while Robert, driven to distraction by strange noises and by articles missing from his home, consults a psychiatrist. The strain proves too much for Robert, and he eventually collapses and is hospitalized. Utilizing his self-taught knowledge of investments and banking, Ambrose passes stock market tips on to Harriet who, in turn, forwards them to Robert. Inevitably, Robert amasses a fortune and quickly proceeds to perfect the international brassiere. When he decides to move to a home without an attic in Geneva, Ambrose sabotages a convention by arranging for Robert's inflatable brassieres to swell to such enormous proportions that the wearers float skyward. After being forced to return home, Robert finally discovers the truth about the man who has lived in his attic for nearly 4 years. Announcing his intention of returning to his first love, music, Robert divorces his wife and gives Ambrose and Harriet his factory for a wedding present. Before long, it is the over-worked Ambrose who leaves for work each morning, while Harriet pushes a button to summon her new lover, Robert, up from the basement.