Amazon Info:
Princess of the Midnight Ball
By Jessica Day George
Galen is a young soldier returning from war; Rose is one of twelve princesses condemned to dance each night for the King Under Stone.
Together Galen and Rose will search for a way to break the curse that forces the princesses to dance at the midnight balls. All they need is one invisibility cloak, a black wool chain knit with enchanted silver needles, and that most critical ingredient of all—true love—to conquer their foes in the dark halls below. But malevolent forces are working against them above ground as well, and as cruel as the King Under Stone has seemed, his wrath is mere irritation compared to the evil that awaits Galen and Rose in the brighter world above.
Captivating from start to finish, Jessica Day George’s take on the Grimms’ tale The Twelve Dancing Princesses demonstrates yet again her mastery at spinning something entirely fresh out of a story you thought you knew.

From Amazon:
Cecilia knows that she is not just another peasant girl; she is actually the true princess, in hiding until the evil forces that killed her parents are vanquished. A commoner named Desmia is on the throne as a decoy.
As she gets older, Cecilia finds it harder to study statesmanship and palace protocol secretly at night and then pretend that she has nothing on her mind other than scrubbing the gruel stains out of her best apron by day.
Cecilia knows that it is time to take charge. Along with her best friend, Harper, she flees to the capital city, determined to reclaim her throne and face the danger head on.
When Harper and Cecilia reach the famed Palace of Mirrors, they discover complications: Princess Desmia believes an entirely different version of the story.
Acclaimed author Margaret Peterson Haddix returns to the charmed world of Just Ella, where a princess-in-hiding and a pretender to the throne discover that nothing is as it appears.