You need to begin reading the Alexa’s Travels series with Bone Dust & Beginnings. While this short-story/novella calls itself Prelude, it is not. Instead it is a continuation of the story of Alexa, part Descendant of Jesus Christ and part Fire Demon.
I am not certain if being part Fire Demon is something that is part and parcel of being a Descendant. Being one does give the “possessed” fairly cool powers. I doubt their victims would agree.
Alexa’s trusted group of men (pets as she calls them) are still stuck to her. They feel fortunate in having such a person to look after and who looks after them. Together they get to fight strange creatures and bad people.
Prelude is fairly well-written. Editing issues are few. I doubt if I am its intended audience.