Enclave

In the years after a virus wiped out most of the population, humanity was teetering on the brink of extinction and the new governing body enforced a law for survival; at the age of sixteen, all girls must travel to The Enclave, where they will spend two years producing children to ensure the propagation of the species. Nine generations later, Piper doesn't want to go. Educated by parents that taught her to read and write, she sees The Enclave as a violation of her rights.
Unable to escape her captors, she is plunged into a race against time to uncover the dark secrets and betrayals perpetuated by The Enclave. If she fails, she loses her right to choose the man she loves.