The world-renowned Princess Ann, a member of the royal family of a small unnamed European kingdom, is in a whirlwind tour of Europe. After visiting London, Paris, and Amsterdam, she arrives in Rome, the Eternal City. Bored and upset with a life where her every waking minute is scheduled and rehearsed, she throws a tantrum and has to be sedated. However, before the drugs take effect, she manages to escape the embassy, determined to spend at least one day doing whatever she wants.