There are 5 books in the Secrets of the Immortal Nephilim series.
The Secrets of the Immortal Nephilim series does not have a new book coming out soon. The latest book, To Challenge the Devil (Book 5), was published in June 2012.
The first book in the Secrets of the Immortal Nephilim series, To Kill a Goddess, was published in October 2011.
The Secrets of the Immortal Nephilim series primarily falls into the Fantasy genre.