The footman, afraid, under the eye of the police, to go and join the cobbler's wife over her solitary labours in the afternoon, found the house unbearable and gave notice. Odile, Madame d'Esparvieu's lady's-maid, not daring, as was her custom after her mistress had retired, to introduce Octave, the handsomest of the neighbouring bookseller's clerks, to her little room upstairs, grew melancholy, irritable and nervous, pulled her mistress's hair while dressing it, spoke insolently, and made advances to Monsieur Maurice. The cook, Madame Malgoire, a serious matron of some fifty years, having no more visits from Auguste, the wine-merchant's man in the Rue Servandoni, and being incapable of suffering a privation so contrary to her temperament, went mad, sent up a raw rabbit to table, and announced that the Pope had asked her hand in marriage. At last, after a fortnight of superhuman assiduity, contrary to all known laws of organic life, and to the essential conditions of animal economy, Mignon, the detective, having observed nothing abnormal, ceased his surveillance and withdrew without a word, refusing to accept a gratuity. In the library the dance of the books became livelier than ever. "That is all right," said Monsieur des Aubels. "Since nothing comes in nor goes out, the evil-doer must be in the house." The magistrate thought it possible to discover the criminal without police-warrant or enquiry. On a date agreed upon at midnight, he had the floor of the library, the treads of the stairs, the vestibule, the garden path leading to Monsieur Maurice's summer-house, and the entrance hall of the latter, all covered with a coating of talc. The following morning Monsieur des Aubels, assisted by a photographer from the Prefecture, and accompanied by Monsieur René d'Esparvieu and Monsieur Sariette, came to take the imprints. They found nothing in the garden, the wind had blown away the coating of talc; nothing in the summer-house either. Young Maurice told them he thought it was some practical joke and that he had brushed away the white dust with the hearth-brush. The real truth was, he had effaced the traces left by the boots of Odile, the lady's-maid. On the stairs and in the library the very light print of a bare foot could be discerned, it seemed to have sprung into the air and to have touched the ground at rare intervals and without any pressure. They discovered five of these traces. The clearest was to be found in the abode of the busts and spheres, on the edge of the table where the books were piled. The photographer took several negatives of this imprint. "This is more terrifying than anything else," murmured Monsieur Sariette. Monsieur des Aubels did not hide his surprise. Three days later the anthropometrical department of the Prefecture returned the proofs exhibited to them, saying that they were not in the records.