Mr. Barnes now began some researches into the past history of Mr. Alphonse Thauret. Obtaining the date of his first registry at the Hoffman House he found that to be about a month before the train robbery occurred. Finding the expressman who had brought his baggage to the hotel, it transpired that it had been taken from an English steamship, yet the name Thauret did not appear upon the list of passengers. As it was certain, however, that the man must have arrived by the ship, it was evident that "Thauret" was an alias. Mr. Barnes copied the ship's list for future reference. A search for the name Rose Mitchel was fruitless, though extended to the passenger lists of all arriving steamers for two months prior to the murder.
Believing that Mr. Thauret must have some communication with foreign friends, and hoping to obtain some clue by the post-marks of any such letters, Mr. Barnes arranged an espionage of the man's mail. But though the hotel clerk reported to him daily for several weeks, there was not one foreign letter. As to money, Mr. Thauret appeared to be well supplied, paying his board-bills promptly with checks upon a neighboring national bank, in which it was ascertained that he had deposited to his credit several thousand dollars.
Thus after a long investigation, Mr. Barnes was chagrined to admit that he had discovered nothing save that Mr. Thauret had come across the ocean under an assumed name, and even this meagre knowledge was a mere matter of inference.
Though baffled in this direction Mr. Barnes had been more successful in another effort which he essayed. This was a line of investigation which he inaugurated, hoping to discover the whereabouts of the child Rose Mitchel, who was so skilfully kept in hiding. He had first instructed Lucette as to the part she was to play, and that young woman, anxious once more to stand well with her employer, had exerted herself to her utmost, entirely succeeding in her mission. This was to obtain some of the writing of the child. "Go to the house again," Mr. Barnes had suggested, "and get into conversation with that same servant who met you at the door on your first visit. Then in some manner obtain a specimen of the child's writing. An old copy-book would be just the thing." Lucette carried out these instructions to the letter, and by bribing the servant girl at the school obtained exactly what the detective had suggested, a copy-book in which little Rose Mitchel had practised writing.
Armed with this, and selecting a specimen, which seemed best suited to his purpose, Mr. Barnes next bribed the mail boy at the Fifth Avenue Hotel to examine all letters addressed to Mr. Mitchel until he should find one in the same hand. It was not until early in March that this patient work resulted in success. Then one day the boy reported to Mr. Barnes that the expected letter had at length arrived. The post-mark indicated that it had been mailed at East Orange, New Jersey.
"So that is where the little bird is hidden," said Mr. Barnes to himself when this information reached him. Summoning Lucette, he sent her to East Orange with these instructions:
"Now, my girl, I'll give you another chance to redeem yourself. You are to go to East Orange and find that child. The most promising plan is through the post-office. I will give you a note to the postmaster that will aid you. Should a letter be sent to the child either by Mitchel himself or by Miss Remsen, you will learn of it through the postmaster. The rest of course will be simple."
"But suppose," said Lucette, "that the child's letters are directed under cover to the parties with whom she is living? What then?"
"Why, stupid, that is what I send you down there for. As the postmaster is an acquaintance of mine, I could get the address, should it reach him, without having you there. But that is only a faint hope. We know that the child is in East Orange. East Orange has just so many houses. You must examine every one if necessary. Now go, and if you don't find the child, I have no further need of you. I give you this commission partly as a chance to redeem your other mistake, and partly because you have seen the child once and could recognize her."
"I'll find her," said Lucette, and she departed.