Ann Brashares, who wrote four insanely popular books about the Sisterhood of the Traveling Pants (two of which were made into equally popular movies), has countless fans. I imagine she also receives a lot of fan mail, and I'd wager that a great deal of it asks the questions "But what happened to Carmen, Lena, Tibby and Bridget next? Did they fall in love, get married, have children? Most importantly, did they stay friends forever?" These kinds of questions gain urgency as fans --- those who were young teens when THE SISTERHOOD OF THE TRAVELING PANTS was first published in 2001 --- are now approaching their mid-20s themselves.