Having recently discovered she is the sole heir to the throne of a tiny European principality, fourteen-year-old Manhattan resident Mia writes in her journal about her attempts to cope with this news, as well as with more typical teenage concerns.

Princess Mia is introduced to her Genovian subjects, and more importantly, she goes out on a date.

High school sophomore Princess Mia records in her diary her struggles with geometry, the expectations of being a college student's girlfriend, running for president of the student council, and a potential ecological disaster in her native land, Genovia.

During the days before her sixteenth birthday, Mia records in her diary her fear that her grandmother and friends may be planning to throw an extravagant Sweet Sixteen party.

Princess Mia, struggling to come to terms with her recent breakup with Michael and prepare for an important speaking engagement at a gala for Domina Rei, finds solace and guidance in the diary of a teenage princess for Genovia, and discovers a secret that may change her country's history forever.

Mia, who is finally a senior at Albert Einstein High, faces difficult choices about boys and her status as princess while her future, and Genovia's, hang in the balance.

"During the Covid-19 pandemic, a section of the diary of Princess Mia Thermopolis of Genovia fell into the hands of Meg Cabot, the Princess's royal biographer. As reported in media outlets such as Entertainment Weekly, The Mary Sue, Refinery 29, Bustle, and more, from March until June of 2020, sixteen entries of the princess's diary were leaked onto Ms. Cabot's blog, to the delight of over a million fans. In these entries, titled The Coronavirus Princess...