Book #5 -- Physik by Angie Sage

This book is number 3 of the 7-book Septimaus Heap series that started with Magyk.  I've read most of them before, but the last book has just been purchased by one the of the girls and I wanted to remind myself of the key characters and plots before reading the last book.  The series is another wizard, who at age 11, and without any real family, is needed to save the world from evil threats.  (Like Harry Potter and Bartimaeus series, but the similarity ends there).  Written for youth, but enjoyed by adults.