Cursed Ancients1 books in series
Clutch of the Demon Publisher's Summary
Cara is a demon hunter. When she interrupts a chain of events orchestrated by a master demon, he punishes Cara by infecting her younger sister with a fatal disease.
Time is running out. Desperate for a cure, Cara hears a whisper of a mystical being trapped beneath stone that may be able to help her for a price....