"The Second Summer of the Sisterhood" is the second book in the Sisterhood of the Traveling Pants series by Ann Brashares. It follows four friends—Lena, Carmen, Bridget, and Tibby—as they navigate their summer experiences while sharing a magical pair of pants that fits them all perfectly. Each girl faces personal challenges and growth during their time apart. Throughout the summer, the girls communicate through letters, sharing their adventures and struggles. The story explores themes of friendship, identity, and the importance of support as they learn to embrace change and the bonds that connect them, despite physical distance.