Baroness von Kuhlen steals a gift from Arsène Lupin that he intended to give to a friend. That's all it takes for Lupin to concoct one of his devilish little schemes, the secret of which only he knows. Under the identity of Prince Renine, he visits Baron von Kuhlen, who owns a beautiful wine cellar, to buy some wine. He discovers that the baron has another passion: archaeology. He digs and searches everywhere, while his wife, out of boredom or provocation, picks pockets left and right.