I just wanted to throw my two cents out there on this one. I won't do a full synopsis because Allison already reviewed it here, and I don't want to give away any of the plot points.
I actually liked this chapter of the story quite a bit. I felt like it slowed down just a bit, and wasn't so full of fast-paced adventure. It had a little more back story which I enjoyed. And there were hardly any of the characters I find annoying (mainly the Holt family and the female spy lady...is her name Irina? See I can't even remember her name). I really enjoyed the play between Uncle Oh and Dan and Amy. And I liked them teaming up with the Kabra siblings, though I won't get into too much of what happened with them. I don't want to give anything away.
Have I said this before? I think I have. This series is a kid-sized version of Katherine Neville's The Eight and The Fire. :-) A quest to learn the secret of Alchemy.
It appears Book 4 comes out June 2, Book 5 in August and Book 6 in November. They really are moving along in the series and keep kids interested by having the books come out so soon after each other.