To avert war between their countries an official marriage is arranged between Crown Prince Boris of Moraine and Princess Flavia of Norvia. Prince Karl of Norvia sees in the alliance an opportunity to gain control of both kingdoms but upon visiting Boris finds him unyielding and independent. Flavia, shedding her stately dignity in the palace garden, is accosted by the flirtatious Boris, who believes her to be the princess cousin; and falling in love, he realizes that he cannot go through with the planned marriage.