On opening night of his new Broadway musical, *Show Boat*, composer Jerome Kern (Robert Walker) reflects on his long career in this star-studded fictionalized biopic. With the help of his mentor, composer James Hessler (Van Heflin), a young Jerry travels to Europe and soon has one of his tunes placed in a successful production. Back home, Jerry's unceasing efforts result in the production of his first show. Jerry's career blossoms and he works with artists like Frank Sinatra and Lena Horne while guiding James' wayward but talented daughter, Sally.