This is a great series, from what I expect is a self-publisher. The minor editorial mistakes that should have been picked up through a good proofreading, actually don't detract from my enjoyment of the story (as many other book have).
There are plenty of plot twists, which I love in a book, which manage to stay believable.
This book, in particular, feels like it is going to tie up all the building plot points and you expect it to be the last in the series, yet there is at least one more to go. Actually, I'm surprise to see the next is billed as 5.5?