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CHAPTER VRETURNED! “You are certain no one but yourself and Mr. Carling possesses a key to the safe, Sir Robert?” “Absolutely.” “And you think it impossible that anyone may have obtained either of the keys and had a duplicate made.” “No copy has been made,” Sir Robert answered. “The pattern is unique, it could not be reproduced except by the makers, and I telephoned to them this morning. In any case they would not have made another key except from my personal instructions.” “H’m.” Snell, the detective, who had been summoned to Grosvenor Gardens on that eventful afternoon, stood thoughtfully sliding the secret panel to and fro. “You are sure no one could have access to either of the existing keys—in the course of the night, or early this morning?” “Quite sure. Carling declares that