When the Boys graduate from C.A.T., they are moved to a new facility where new challenges await. At first, it seems like 62's new home comes with more freedom than he's ever had before. It doesn't take long for him to discover that the troubles of his past are nothing compared to the danger that awaits.
In his new home, 62 meets a Boy with no number who defies every truth in Adaline. Unsure if he can continue to follow the path that Adaline has laid out for him, 62 discovers that trying to make his own way comes with consequences far beyond anything he's ever imagined.