Ninety years ago, the last naturally-born man took his final breath, and a new world order began. Lunaria thrives as a society led by women, for women, untouched by war, scarcity, or oppression. But there's one secret kept in the shadows. The Donors... Sophie, born in the Luanaria but raised by a secretive Donor Resistance, is about to re-enter the female-led society on a mission that could destroy everything the Lunarians had built.