Five hundred years of peace between queendoms shatters when girls inexplicably stop being born. As the Drought of Girls stretches across a generation, it sets off a cascade of political and personal consequences across all five queendoms of the known world, throwing long-standing alliances into disarray as each queendom begins to turn on each other - and new threats to each nation rise from within.

Uniting the stories of women from across the queendoms, this propulsive, gripping epic fantasy follows a warrior queen who must rise from childbirth bed to fight for her life and her throne, a healer in hiding desperate to protect the secret of her daughter's explosive power, a queen whose desperation to retain control leads her to risk using the darkest magic, a near-immortal sorcerer demigod powerful enough to remake the world for her own ends - and the generation of lastborn girls, the ones born just before the Drought, who must bear the hopes and traditions of their nations if the queendoms are to survive.