My father and I just finished A Corner of White, book #1 of The Colors of Madeleine series by Jaclyn Moriarty.
How can one describe a book unlike anything one has ever read? Like this, I suppose... In a Kingdom where seasons cycle daily or weekly depending, where Colors (like the normal kind but renegade) attack or enliven people depending on where it is in the spectrum, and where Butterfly Children help crops grow if you let them out on time, dark secrets are hidden behind wondrous yet seemingly simple and grounded eccentricity.
You saw the truth, Madeleine of the World, and I hope you are willing to help the Kingdom of Cello. Elliot Baranski and a certain royal need help. Ah, the joy and danger of rescue missions!