Flame and Sparrow

Flame and Sparrow by S. M. Gaither is a romantasy about Karys, who joins elven rebels and enters the service of the God of Fire to find her missing sister. On the eve of her twentieth birthday she finds a dying divine creature at her door, and two weeks later her sister vanishes.

Convinced the gods are responsible, she seeks a place among the servants of Dravyn to learn the truth and to destroy the gods. In the divine courts she discovers she cannot fully trust him, and that her own secrets are in danger. This is the first book of the Flame and Sparrow Duology.