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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 evildoer 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
