Summer Sisters chronicles the lifelong friendship between two women, from their girlhood summers together on Martha's Vineyard to their more complicated adult relationship. Caitlin dazzled Vix from the start, sweeping her into the world of the Somers family, a world of privilege, adventure and sexual daring. Vix's bond with her 'summer' family had forever reshaped her relatioship to her own, opening doors to opportunities she had never imagined. Then, the summer she falls passionately in love, in one shattering moment on a moonswept beach, everything changes, exposing a dark undercurrent in her extraordinary friendship with Caitlin that will haunt them through the years. A riveting exploration of the choices that define our lives, of friendship and love, of the families we are born into and those we struggle to create, and a story for every woman who has ever had a friend too dangerous to forgive and too essential to forget.