I could read about Mia forever. I hope I get to, too. There's enough story setup here for at least a few more books. 
 I love, love, love spending time in this world. Everything about it is uproariously funny. ("Despite all evidence to the contrary, Grandmere believes that Ron Weasley, not Voldemort, is the villain of the Harry Potter series.") Mia has grown up enough for this to feel different-but-the-same compared to the initial series. 
 Reading this reminded me about just how great The Princess Diaries movie is, too. Just the first one, duh. With the exception of Grandmere--and man, do I love book Grandmere--all of the other characters are perfectly consistent with the book versions, even by book eleven! 
 I've always loved how Meg Cabot has portrayed Mia as an awkward, realistic, and relatable character even if the circumstances around her are a bit unbelievable. Princesses...they're just like us.