The Prince of Razzamatazz is in America being educated. He receives a telegram telling him to travel to the Kingdom of Thermosa to vie with a drunken rival, the Prince of Roquefort, to marry "the fairest bud of the kingdom": Princess Florelle. The Prince of Razzamatazz is unhappy about this development because he would prefer to marry his girlfriend, Verona Vermuth. When she sees that an "American boy", a book agent, bears a striking resemblance to the prince, she convinces the American boy to take the prince's place. His tutor and bodyguard accepts a large bribe to go along with the plan. Immediately after the American boy leaves, the prince informs his girlfriend that since he can no longer be a prince, he is cut off from all royal funds. She quickly turns on him and throws him out of her home. Upon arriving in Thermosa, the American boy has to escape a violent anti-monarchist mob. Once he gets to the palace, he has second thoughts about replacing the prince, but he changes his mind when he sees several pretty ladies-in-waiting and Princess Florelle. Florelle eventually chooses the American boy over the Prince of Roquefort. Shortly afterward, the real Prince of Razzamatazz arrives and exposes the American boy as a fraud. The boy is thrown out onto the street just as the agitated anti-monarchist mob is attacking the royal palace. The American boy accidentally fires a cannon into the palace—winning himself the new job as the country's president, while the monarchy topples. As president, he intervenes to rescue Florelle and her parents from the mob, using his presidential powers.
