Tales of the Fae, book 1: The Shadow's Sister
Kate Seger

The night the old empress passed into the void, two daughters were born in the Shadow Court - one a ruler, the other a traitor. Bookish and ill-suited for the vicious world of the Shadow fae, Lorna escapes her sister's wicked designs by fleeing to the Court of Sky.

Once there, she finds herself in an unfamiliar world, surrounded by enemies. As she struggles to make peace with her betrayal, she must decide - who can you trust when you're fighting for the wrong side?