After an extended stint in rehab following a major family catastrophe, Kym (Hathaway) returns to her picture-perfect Connecticut hometown to attend the elaborate wedding of her older sister Rachel (played with considerable spark by Rosemarie DeWitt). Kym's arrival causes long-festering hurts to resurface, and the Buchmans' family unity is soon hanging by a thread. Issues of trust and reconciliation flow through the film, leading to discord between parents and their children, as well as among siblings and family friends, even as they all struggle to maintain a ceasefire during Rachel's nuptials. While Kym is offended by her sister's seeming ability to live a faultless existence, the rest of their family and friends resent Kym's penchant for self-serving theatrics and darkly comic one-liners.