No Rinzewind in this book, I liked it very much, perhaps more than the first two.
In fact I red it in Christmas Eve and Christmas Day.
The story of a girl who is the eighth "son" of an eighth son which when she is born a wizard passes her his powers thinking she would be a he, but with this, the first female wizard can be a possibility which, of course, is neither accepted by women or men, so when her powers start to show, a witch takes care of her education and tries to make her a good witch, but her powers are far more powerful than an usual witch, so the witch decides to take her to the Wizards' University so she can control her full power.
The wizard masters laugh at her, but finally the magic prevails and forces them to accept her.
Will the next book continue this story? Who knows, I'll sure read it.