Carolyn is a 37 year-old mother of four in the midst of a passionate affair. She's spending up to 18 hours a day with her lover online on Second Life, the website. She has never met him, but, to her husband of nine year's dismay, she is abandoning her family and flying 5,000 miles to London to start a new life with her lover, Elliot. What makes this website, which has three million members, so compelling?