I bought this book because I needed a quick read on vacation. I'm glad I did! The author is a skilled journalist, clear analyst and a personal friend of p. Jorge Bergoglio. The book is thoroughly researched. O'Connell read thousands of articles in half a dozen languages before, during and after the conclave so you don't have to. This is augmented by the many interviews he has done with Bergoglio and many of the cardinals. The author treats "inside information" with respect. His portrait of Pope Francis is respectful but not fawning.
O'Connell reveals how the themes of Pope Francis' papacy became clear within the first week of his papacy, and were in fact the same as the themes of his episcopacy. As provincial of the Argentinian Jesuits, Bergoglio was considered conservative. At the conclave of 2005 (which elected Benedict XVI), some cardinals considered him a leftist radical. O'Connell shows how Bergoglio did, indeed, develop clarity over time, but mostly it was the Catholic hierarchy in general which moved sharply to the right in the same years.
O'Connell's book shows, therefore, not only the uniqueness of Pope Francis, but also what a true resourcement he brings.
[Disclaimer: as a Franciscan friar who has had the privilege of studying with some of the current voting cardinals and a disciple of professor Ratzinger, I was an immediate fan of Pope Francis.]