The Kingdom of Sweets by Erika Johansen

This gloriously transportive reimagining of The Nutcracker tells the tale of twin sisters, divided by envy and magic, set against each another one fateful Christmas Eve.

Light and dark—this is the cursed birthright placed upon Clara and Natasha by their godfather, Drosselmeyer, whose power and greed hold an entire city in his sway. Charming Clara, the favorite, grows into a life of beauty and ease, while Natasha is relegated to her sister’s shadow, ignored and unloved.
 
But Natasha seizes the opportunity for revenge one Christmas Eve, when Drosselmeyer arrives at the family gala with the Nutcracker, an enchanted gift that offers entry into an alternate world: the Kingdom of Sweets.
 
Following Clara into the glittering land of snow and sugar, Natasha discovers a source of power far greater than Drosselmeyer: the Sugar Plum Fairy, who offers her own wondrous gifts . . . and chilling bargains. But as Natasha uncovers the truth about a dark destiny crafted long before her birth, she must reckon with forces both earthly and magical, human and diabolical, and decide to which world she truly belongs.