Fire is a companion to Gracling. I am not certain of the connection between Fire and Gracling except that Fire can read minds and control minds. That probably is Fire's grace, her gift. It tells the story of a young monster in the shape of a human who is hated because of her difference and supernatural abilities. It is a fantasy but much of the book is about warring neighbors with a slight twist of romance between the characters.
It was okay not as spell binding as Gracling, took me longer to read then Gracling. I had to push myself to finish reading Fire.