Copenhagen, 1956: Tanaquil Le Clercq, known as Tanny, is a gorgeous, talented, and spirited young ballerina whose dreams are coming true. She is married to the love of her life, George Balanchine—the famous mercurial director of New York City Ballet—and she has become a star around the world. But one fateful evening, only hours after performing, Tanny falls suddenly and gravely ill; she awakens from a feverous sleep to find that she can no longer move her legs. Tanny is diagnosed with polio and Balanchine devotes himself to caring for his wife. But after Tanny discovers she will never walk again, their relationship is challenged as Balanchine returns to the company, choreographing ballets inspired by the ever-younger, more beautiful and talented dancers. Their marriage is put to the ultimate test as Tanny battles to redefine her dreams.