** spoiler alert ** While I am interested in this series, I am definitely starting to lose interest in reading them. I can do without all the distant cousins trying to kill each other and all the crossing and double crossing. I could practically read this book in bullet points.

Clue is X.
Children go to Y.
Z tries to stop them but they elude Z by breaking some law or stealing something.
Children think the next clue is A.
Nellie is abducted.
Children rescue Nellie.
Children discover something new about A.
Next clue is B.

There is definitely not very much character development. You can pick up any book in the series and not get any more information about the main characters.

Plus the kids "powers" aren't like moving buildings or anything. But an 11 year old's ability to memorize anything, even meaningless numbers or letters seems quite implausible. But don't get me wrong, I am not against implausible, but when everything depends on this one implausible fact, the story starts to fall apart. If this kid is some kind of autistic person, fine, but he is way to communicative to be autistic.

So it's a good story, but you don't really need to read it to get the story.