Return to the world of Meg Cabot's bestselling and beloved Princess Diaries series in From the Notebooks of a Middle School Princess—this time through the illustrated diary of a spunky new heroine: Princess Mia's long lost half-sister, Olivia! Olivia Grace Clarisse Mignonette Harrison is a completely average twelve-year-old: average height, average weight, average brown hair of average length, average brown skin and average hazel eyes. The only things about her that aren't average are her name (too long and princess themed), her ability to draw animals (useful for her future career as a wildlife illustrator), and the fact that she is a half-orphan who has never met her father and is forced to live with her aunt and uncle (who treat her almost like their own kids, so she doesn't want to complain). Then one completely average day, everything goes wrong: the most popular girl in school, Annabelle Jenkins, threatens to beat her up, the principal gives her a demerit, and she's knocked down at the bus stop . . . Until a limo containing Princess Mia Thermopolis of Genovia pulls up to invite her to New York to finally meet her father, who promptly invites her to come live with him, Mia, Grandmère and her two fabulous poodles . . . . Maybe Olivia Grace Clarisse Mignonette Harrison isn't so average after all!

While Mia tries to get over breaking up with her boyfriend, she discovers a diary kept by a former princess of Genovia from the 1600s, the contents of which could change the fate of her country forever.

From the #1 New York Times bestselling author of the Princess Diaries series, comes the very first adult installment, which follows Princess Mia and her Prince Charming as they plan their fairy tale wedding—but a few poisoned apples could turn this happily-ever-after into a royal nightmare. For Princess Mia, the past five years since college graduation have been a whirlwind of activity, what with living in New York City, running her new teen community center, being madly in love, and attending royal engagements. And speaking of engagements. Mia’s gorgeous longtime boyfriend Michael managed to clear both their schedules just long enough for an exotic (and very private) Caribbean island interlude where he popped the question! Of course Mia didn’t need to consult her diary to know that her answer was a royal oui. But now Mia has a scandal of majestic proportions to contend with: Her grandmother’s leaked “fake” wedding plans to the press that could cause even normally calm Michael to become a runaway groom. Worse, a scheming politico is trying to force Mia’s father from the throne, all because of a royal secret that could leave Genovia without a monarch. Can Mia prove to everyone—especially herself—that she’s not only ready to wed, but ready to rule as well?