Fergus O'Connell is an itinerant American dentist, offering his services gratis to the rural Argentine populace. He is able to do this because of the supposedly no-strings sponsorship of a "dental consciousness" foundation. While his motorbike is being repaired, O'Connell falls in love with Estela, the garage-owner's daughter. Both lovers have prior commitment--he is married, she is engaged--but they go off together all the same.