During the summer of 1977, Vix Leonard's world changes forever when she is swept into a world of unimaginable privilege after she becomes best friends with Caitlin Summers. For years they are inseparable, growing up together and spending each summer on Martha's Vineyard. Even though they haven't been close in years, Caitlin begs Vix to be her maid of honor at her wedding. Vix agrees, hoping to discover what caused the rift between them that summer long ago.

For her August book club pick, Jenna Bush Hager picked an old favorite as the perfect beach read about female friendships. I was less enthralled with Judy Blume's adult novel than Jenna. Summer Sisters starts as an erotic coming-of-age story with a stereotypical cast of characters. By the second half of the novel, Vix matures more than Caitlin and her teenage boyfriend, creating a push and pull that shows the destructive side of childhood friendships.