After reading this series about a year ago, it is awfully hard to recall certain plots of certain books. But I can definitely recall certain parts to this story and my opinion on them.
Book 9 in this series, it certainly kept my interest in the rest of this series. It's like reading a famous five adventure with a dark and brilliant twist.
I can't exactly recall the plot but what I can say that it is another great book in this series and you must read it.