A Curse Bright and Breathing by Moira Darling

A holy sacrifice. A faithless mercenary. A fate born of blood and moonlight.

Naera has spent her life behind sacred walls—glowing under moonlight, raised to die for a goddess she’s never heard speak. But when her name rises for the altar, she runs. She doesn’t get far. Not before the woman from her dreams steps out of the dark with shackles in one hand and a blade in the other.
Selis is a mercenary who doesn’t believe in gods, only gold. Cold, cunning, and hard to kill, she takes the job like any other: retrieve the cult’s escaped holy daughter and deliver her—breathing—for a reward soaked in blood money. But the vampire is softer than she expected. And stranger? She truly glows.
Chained together by fate and flame, they’ll have to decide what’s worth saving: duty, themselves… or each other.