Plot: American Masters – Joan Rivers: A Piece of Work takes the audience on a year-long ride with Joan Rivers in her 76th year of life; it peels away the mask of an iconic comedian, laying bare both the struggle and thrill of living life as a groundbreaking female performer. The film by Ricki Stern and Annie Sundberg premieres September 23, 2014 at 10:30 pm on PBS (check local listings)