five o'clock
`` If he dies , '' said Beautrelet , `` and if his accomplices are sure of it , then see to the safety of Mlle. de Saint-Veran . Monsieur le Juge d'Instruction , for the vengeance will be terrible . '' * * * * * A few minutes later and in spite of the entreaties of M. Filleul , who would gladly have made further use of this fascinating auxiliary , Isidore Beautrelet , whose holidays ended that day , went off by the Dieppe Road . He stepped from the train in Paris at five o'clock and , at eight o'clock , returned to the Lycee Janson together with his schoolfellows . Ganimard , after a minute , but utterly useless exploration of the ruins of Ambrumesy , returned to Paris by the fast night-train . On reaching his apartment in the Rue Pergolese , he found an express letter awaiting him : * * * * * Monsieur l'Inspecteur Principal : Finding that I had a little time to spare at the end of the day , I have succeeded in collecting a few additional particulars which are sure to interest you . Arsene Lupin has been living in Paris for twelve months under the name of Etienne de Vaudreix .