Robert Blossom is a brassiere manufacturer and workaholic. When his wife Harriet's sewing machine breaks, he sends his bumbling employee Ambrose Tuttle to repair it. Mrs. Blossom seduces him, then hides him in the attic, instructing him to sneak out in the middle of the night. Ambrose, however, is enchanted by the woman and decides to settle in to serve as her secret paramour. When he's reported missing, Det. Sgt. Dylan from Scotland Yard is assigned to the case, one he doggedly pursues for years. The mysterious noises Robert frequently hears overhead finally lead to his nervous breakdown, but Ambrose saves the day by passing along stock tips that turn his employer into a millionaire. The grateful Mr. Blossom not only allows Ambrose to remain with his wife, but presents the couple with his factory as a wedding present.