My son and I just finished Septimus Heap Book 3: Physik, by Angie Sage. My daughter had told me she got a few books into the series and gave it up for lost, but after reading this one, I still feel that the story arc has some legs, so we'll probably read another.
Physik is a different branch of the mystical (or should I say Mystikal) sciences practiced by the wizards, and other learned people in this series, but one that in Septimus's time, is now looked down upon as so much potions and herb lore. Historically however, Physik was the powerful science of alchemists and other physicians. All of the main characters return in this installment, and many of the supporting charters, but some just in bit parts. This story also has some interesting twists that will pave the way for some fun stories in the future, but they aren't so outlandish that they seem forced.
We still had a laugh with the bold text and extra Es and Ys in all of the magical phrases. My son asked if I would pronounce them differently so he could enjoy them as much as I do when I'm reading. So will we keep reading? I think so. In the meantime, the fourth volume in the Nicolas Flamel series came out last month and we're reading that now. I don't know if I ever wrote about the third book in that series, The Sorceress, but it was good and we were waiting for this recent one to come out.