Each Book of the series is a stand alone.

 I read many books about immortals and humans interactions and decided I wanted to take my characters a different route but wanted to remain true to how the ancient texts described the immortals. If you will note, even the covers are different.  I wanted each book to be able to stand alone on it's own merit is why each cover is different.

I deliberately wrote each book so that it would not have to lean upon it's predecessor for a reader to understand what's going on. I wrote each to bear it own merit. That's why the major ones I was able to create a smaller spin off book like, "The Time before time"which is a spin off the book of Clash with the Immortals."

The first few paragraphs pick up where the predecessor left off and the last few sentences give a hint in what's to follow in the next book. And from there the book takes on a life of it own totally different from the one before or after.