John Clark is a middle aged Chicago estate lawyer. He loves his family, which includes his wife Beverly, but their combined busy schedules and getting caught in a rut after two decades of marriage has left him feeling unfulfilled. While taking the L train home every night, he notices the same young, beautiful contemplative woman staring out of one of the windows of Miss Mitzi's Dance Studio, which specializes in ballroom. He is intrigued enough with her beauty and sadness to go in one evening on his way home.