Marie Lu finishes up her Legend trilogy with Champion. Day and June are back in the Republic, with June serving as Princeps-Elect and Day keeping to himself and keeping his brain tumor (?) to himself while he cares for his blind brother, Eden. However, a plague originally engineered in the Republic is taking over the Colonies, making the threat of war imminent. While the Republic is desperately trying to find a cure for the plague, Day has to help the Elector plan how to save the Republic against the Colonies if they do attack. I thought it was a really good ending to a series (unlike Mockingjay...huff).