This blew me away. Incredible world building and character development. And the romance! So good! If you've read A Court of Thorns and Roses and don't know what to read next, pick this up!

 

Publisher's description:

Do not touch the sword. Do not turn the key. Do not open the gate. Twenty-four-year-old Saeris Fane is good at keeping secrets. No one knows about the strange powers she possesses, or the fact that she has been picking pockets and stealing from the Undying Queen’s reservoirs for as long as she can remember. In the land of the unforgiving desert, there isn’t much a girl wouldn’t do for a glass of water. But a secret is like a knot. Sooner or later, it is bound to come undone. When Saeris comes face-to-face with Death himself, she inadvertently reopens a gateway between realms and is transported to a land of ice and snow. The Fae have always been the stuff of myth, of legend, of nightmares…but it turns out they’re real, and Saeris has landed right in the middle of a centuries-long conflict that might just get her killed.