In "Join the Club," Rosenberg identifies a brewing social revolution that is changing the way people live, based on harnessing the positive force of peer pressure, and shows how peer pressure has reduced teen smoking in the United States, made villages in India healthier and more prosperous, helped minority students get top grades in college calculus, and even led to the fall of Slobodan Milosevic.

It is 1979, and sixteen-year-old Alex is a senior in high school. All of her friends are losing their virginity, and she is being pressured to join the club. Meanwhile, her family is falling apart. Their house, which is more like a commune than a home, begins to unravel. Her mother and father separate, and her mother and "best friend", Clarice, goes off the deep-end sexually. She begins exploring₂ many new relationships with different men.