I loved learning more about Arriane and Cam, what was behind the choices they made and the explanations of how things came to be in the main series.
Mainly this book just whet me appetite for the fourth book in the series, Rapture. Unfortunately I will have to wait an entire 2 more months for it. But at least I had this jaunt back into the Fallen world as a reprieve from the long break between books three and four.