The last girl

A mysterious worldwide epidemic reduces the birthrate of female infants from 50 percent to less than one percent. Medical science and governments around the world scramble in an effort to solve the problem, but twenty-five years later there is no cure, and an entire generation grows up with a population of fewer than a thousand women. Zoey and some of the surviving young women are housed in a scientific research compound dedicated to determining the cause. For two decades, she's been isolated from her family, treated as a test subject, and locked away, told only that the virus has wiped out the rest of the world's population.