Mystery princess : a retelling of Cinderella / (bk. 2 Return to the Four Kingdoms)
(Book)

"Daria has spent her whole life caring for others. So when she's rescued by traveling merchants while fleeing for her life, she's more than happy to work for them in return for her safety. But danger follows her, as does Prince Percy. Daria thought she'd left the complications of balls and royalty behind her, but she can't hide as a servant forever--not when whole kingdoms are in peril. As the threat grows, so do the risks Daria is willing to take. But even as she puts herself in danger, Daria doubts she could ever be enough--for the people who need saving or the prince himself. In this reimagining of the classic fairy tale, Cinderella, the overworked orphan must face dangers, doubts, and traitors before she can hope to triumph in a ballroom."--Publisher's description.