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 is so quiet that her parents often joke, 'Has Cat got your tongue?'

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 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.