John Maude and Betty Silver are in love, but when John turns out to be heir to the principality of Mervo, a small Mediterranean island not a thousand miles from Monte Carlo, he finds himself ensnared in the establishment of a new casino on the island, much to his beloved’s high-minded disgust. She leaves him and takes a job with an American family in London; he abandons his post to follow her. Eventually their misunderstandings are disentangled: the pair are reunited, betrothed and bound for a new lifein the United States.