Sometimes an entire life can change in just one night.

In Los Angeles, Max Carlyle makes a good living directing commercials and has a happy home life with his wife, Mimi, and two children. When Carlyle travels to New York City to visit his friend Charlie, who has been diagnosed with AIDS, he has repeat run-ins with a beautiful woman, Karen, and eventually sleeps with her. Though he goes home the next day and doesn't return until a year later, Carlyle's infidelity still lingers.