After disease and nuclear warfare decimate the world population, 17-year-old Nadia is sure she's the last person left on Earth. She buries her before-the-end memories and focuses on survival. Then one night, she hears a voice on her radio and everything changes. Nadia finds comfort in her new-found companions, but they also discover an unsettling thread tying them together: their shared birthdays. As they begin to unravel the mysteries surrounding their survival, they soon realize it was no accident, and that they could be in far more danger than they ever imagined...