Wither by Lauren DeStefano

At age sixteen, Rhine Ellery has four years to live. Thanks to a botched effort to create a perfect race, all females live to be twenty, and males live to age twenty-five. While geneticists seek a miracle antidote, orphans roam the streets and polygamy abounds. After Rhine is kidnapped and sold as a bride, she is desperate to escape from her husband’s strange world, which includes a sinister father-in-law in search of the antidote and a slew of sister wives who are not to be trusted. On the cusp of her seventeenth birthday, Rhine attempts to flee—but what she finds is a society spiraling into anarchy.