One morning, Mr. Lucien Chastellux, known as "the prince", receives a letter from abroad from a young woman who introduces herself as his daughter. His daughter? But which daughter? Lucien has no children, as far as he knows. And then, what arrogance, what shamelessness! To claim to be the descendant of the prince! He searched in his memory, no, nothing, nothing of this kind. Perhaps, all the same, it would be necessary to go to look at it more closely, and here he is thus on his way to the Americas. For God's sake, will the mystery be solved there? Wouldn't this young woman, Idiotie, be after his fortune (his heart's fortune, at least, because he is broke)? We shall see, as we read this story, which will hold a few surprises for the prince, since across the Atlantic he will have a rendezvous with the woman who calls him "Daddy", but also, providentially, with Love...