Hannah has always felt in the shadow of her older sister, Cat. Cat is the flamboyant one, the one who can make everyone laugh. Hannah's so quiet that her parents often joked: Has Cat got your tongue?

Now Hannah has a daughter of her own, who is about to get married, and on the day of the wedding, Cats caustic tongue is let loose with devastating consequences. As Hannah is compelled to examine her past and to 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. And while the truth has the potential to finally unite the sisters, it also has the power to tear them apart for good . . .