The Second Summer of the Sisterhood by Ann Brashares

Carmen, Lena, Tibby, and Bridget are back, a year later and a year wiser. This summer, Tibby is off to a film camp, and Bridget impulsively jets off to Alabama to visit her estranged grandmother while Carmen and Lena remain in Maryland. Lena struggles to get over her love of Kostos and deals with an unexpected visitor, while Carmen has difficulty accepting her mother's new relationship.

Definitely not light fluff- deals with real life on a deeper scale. Not quite as good as the first one, but still an enjoyable read. The girls have really grown and expanded as characters and as readers you learn more about them and connect to them even more. The bonds between the girls and their mothers were honest and real- not forced or exaggerated.