Hannah has always felt in the shadow of her older sister. Cat is the flamboyant one, the one who can make everyone laugh. Hannah is so quiet that her parents used to joke about it. Now Hannah has a daughter of her own, who is about to get married. On the day of the wedding, Cat's caustic tongue is once again let loose - but with devastating consequences. As Hannah is compelled to examine her past and try to make sense of her complicated relationship with her sister, she begins to unravel the secrets and lies on which their seemingly normal family was built.