On the night of the Big Carnival, Roy Donnery meets a beautiful stranger in the Old Park. Their love flashes like lightning - instantly and brightly. Roy and his nameless lover spend a fabulous night together, and at dawn the girl disappears. Trying to forget the mysterious beauty, Roy plunges headlong into investigating a smuggling case. The tracks lead to one of the richest houses in the city, and Donnery obtains an invitation to this “luxurious hangout” for a costume party. Need I say that in the young hostess of the ball he recognizes his night guest?