A Dance of Flame and Shadow by Sarah Batty

Half-human, half-Fae, and the last of her kind, Jayne will protect her siblings at any cost.

Jayne and her siblings have always laid low, keeping to the shadows of the mortal realm, where magic is strictly forbidden. But when Jayne’s brother is captured by the king, she risks her very existence on a perilous mission to free him.
That’s until her plans are dashed by the Prince of the Winter Court, who kidnaps Jayne, and whisks her away to Faerie—a kingdom she thought no longer existed. With the handsome prince’s meddling, her missing sister, and her brother’s doom, there is no time to waste.
Forced to forge unlikely alliances, Jayne must embark on a daring rescue mission, where the line between enemy and ally blurs with every step. She will do whatever it takes to get her brother back—even if it means defying her own destiny.