Alison and her son Arie survived a global pandemic along with a remnant of humanity, but the annual cure that keeps them alive also steals their memories. The harsh rule of a shadowy governing organization known as The Agency is grim enough, but Alison's world is torn apart when Arie goes missing. Alison joins a team of resistance fighters to uncover the truth, but if she can't find Arie before she has to take the serum again, she won't remember she even has a son.