Scorpica (The Five Queendoms 1)

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.