Wings of Fire
The books' themes have also been noted. Sutherland works with several big themes in each arc, and writes the books with big emphasis on character interaction. Themes include freedom versus fate, parenting, expectations, nature versus nurture, giftedness, and the meaning of responsibility. She also explores mind-reading, prophecy and the role of magic in fantasy literature with her concept of "animus magic" - magic that comes at the cost of a dragon's soul. Additionally, Sutherland's unique religious and multicultural upbringing (being exposed to many different ideas and cultures because she's lived and traveled all over the world) has been noted.