Joanne McMullen's fears for her sister's sanity have brought her to remote King's Island, Maine. Mary's grief over the loss of her child is threatening to send her over the edge—and her insistence that she has heard an eerie, childlike wailing in the woods fuels Joanne's anxiety. And now Mary's taken to disappearing at midnight in search of the source of the heartrending moans. But it's not just her sister's encroaching madness that is chilling Joanne's blood—it's her own. Because suddenly, impossibly, she also hears the crying child.