With a bit of last summer's sand in the pockets, the Traveling Pants and the Sisterhood that wears them embark on their 16th summer. Bridget: Impulsively sets off for Alabama, wanting to both confront her demons about her family and avoid them all at once. Lena: Spends a blissful week with Kostos, making the unexplainable silence that follows his visit even more painful. Carmen: Is concerned that her mother is making a fool of herself over a man....

The Sisterhood of the Traveling Pants graduates from high school and spends their last summer before college learning about life and themselves.