Mahurin, Shelby. Scarlet veil (Series) #1

After being sworn in as the Chasseurs' first huntswoman, Célie wants to protect Belterra alongside her fiancé and captain, Jean Luc, but her past haunts her -- like how she failed to protect her sister -- and a new evil is rising, with its mesmerizing eyes locked on her

Six months have passed since Célie took her sacred vows and joined the ranks of the Chasseurs as their first huntswoman. With her fiancé, Jean Luc, as captain, she is determined to find her foothold in her new role and help protect Belterra. But whispers from her past still haunt her, and a new evil is rising--one that Célie herself must vanquish, unless she falls prey to the darkness