Five years after The Princess Diaries, Mia Thermopolis has just graduated from Princeton University's Woodrow Wilson School of Public and International Affairs and is returning to Genovia with her bodyguard, Joe. There, she will await her reign once her grandmother, Queen Clarisse, steps down as Queen. During Mia's twenty first birthday party, she dances with all the eligible bachelors in hope of finding a husband. She becomes attracted to a handsome gentleman named Nicholas. During the course of the night, Mia's tiara falls off and is caught by a Member of Parliament, Viscount Mabrey, who secretly plans to steal Mia's crown. While the Parliament is in-session the next morning, Mia stumbles upon a hidden room that allows her to secretly listen in. Viscount Mabrey reveals his nephew, Lord Devereaux, is another heir to the Genovian throne. Despite Queen Clarisse's objection, the only way Mia can assume her duties as Queen is if she marries within the month. Clarisse invites Lord Devereaux to stay at the palace, while Mia is shocked to discover Lord Devereaux is actually Nicholas. Mia's best friend, Lilly Moscovitz, surprises her by visiting. Together, they pick through potential husbands. Mia eventually chooses Andrew Jacoby, Duke of Kenilworth, and days later, they are engaged. Mabrey plans to have Nicholas woo Mia and dissolve the engagement.