Donald Hardwick (Dick Powell) is a stuffed-shirt, classical music professor. His family and small-town music college that he works are of equal mindset. When Don visits his black-sheep aunt in New York in order to find a buyer for his Rhapsody he is exposed to her shocking swing music crowd. His life begins to make dramatic changes after drinking a "lemonade" that turns out to be a Hurricane.

Joe spends a lot of his time at Nick's Pacific Street Saloon. Tom, who credits Joe with once saving his life, stops by regularly to run errands for Joe. Today, Tom notices a woman named Kitty when she comes into Nick's, and he quickly falls in love with her. Meanwhile, a distraught young man repeatedly calls his girlfriend, begging her to marry him. Nick himself muses on all the various persons who come into his bar, some to ask for work and others just to pass the time.

In the slums, teenager Frankie Warren hangs out with a rowdy gang who one day knock him out in a fight. In court, the boys refuse to reveal who struck the knockout blow, and all are subsequently sentenced to a reformatory, cruelly run by two corrupt guards. New deputy commissioner Mark Braden arrives determined to change things, but despite the help of Frankie's sister, Mark's reform plans -- and Frankie's future -- may be sabotaged from within.