What happens to book 2 in a series???

This was okay. I must admit, I nearly turned back when I realized that there were four books.. until I realized that the fourth book is a prequel.

I am not sure when I will finish this series. I am just catching up on some books, and I have to admit although entertaining, this book really didn't leave a big impression.  I read one review out there and it said that this was a great idea, stretched in to three books. I can see that after reading the first two.  I like them.. I just can't say that I am totally engaged and racing to the read the third book to see how it all ends.