In the novel “The Perfume of the Lady in Black,” which is a continuation of the famous “The Mystery of the Yellow Room,” we once again meet the young journalist named Rouletabille. This time he does not merely engage in a duel with a sophisticated criminal who virtuously changes disguises. Thanks to his insight and energy, the mystery of the beautiful lady in black is revealed, and the journalist, who grew up without parents, understands why the scent of her perfume seems so familiar to him.