I would like to point out that I bought this book as a blind date with a book, without having ANY previous knowledge to the rest of the series.
However!!
I really appreciated how the author has laid out the situations in the book, in such a way that the reader would still understand what is going on, despite not having read the previous books. I only really caught on that I must be missing something midway through the book - the characters made more references to previous events and being honest, at first I didn't think much of it.
Another really cool thing about this book is that every quarter of the book, is spoken through each of the main characters' point of views, one at a time.
This is a good technique that I haven't seen in other books I have read, but it is a good detail to add, as the reader gets to understand more about how the main characters think, connect with them, and to also get a bit of a cliff hanger whenever the point of view changes.
Personally, I feel that this book has a bit of everything. I recommend this book to others who also want a bit of everything - although this book is fictional, it contains romance, mystery, some sci-fi, adventure, a bit of thriller too I'd say, and action to link it all together.
P.S. Word of advice, perhaps read the previous volumes before you realise you're reading the last book in the series!