Lu, Marie.
CHAMPION
New York : G. P. Putnam's Sons, 2013
IL YA
ISBN 0399256776

June and Day are back but they are not together.  June is working with the Republic.  She is now the Princeps Elect.  Meanwhile, Day is working with the military and is stationed far from June.  Day's brother Eden is with him and healing from the plague.  When a new strain of plague breaks out, the Republic asks that Eden be turned over for testing to come up with a cure for the plague.  Day will never agree to letting Eden be experimented on again.  But June pleads with Day to help save the Republic.  The Colonies are blaming the Republic for the outbreak and have threatened war unless a cure is found and given to the Colonies.  Once again, June and Day must choose country over their own love.