What is the author's style in Desert Queen: The Extraordinary Life of Gertrude Bell, Adventurer, Adviser to Kings, Ally of Lawrence of Arabia by Janet Wallach?

This nonfiction book is written in the third person limited perspective. This means that the person telling the story is writing a biography about the book's title subject, Gertrude Bell, and the author delivers the events and points of significance of Gertrude's life from a limited point of view. Because the book is a biography, the author relies on extensive research of Gertrude's life to understand her life and the type of person she was.