"A gentleman with very long hair and an aquiline nose, dark, strange, and handsome, called in at my department and asked if I could tell him the name of Sir Charles Vandrift's London banker. He said he had a sum to pay in to your credit, and asked if we would forward it for him. I told him it was irregular for us to receive the money, as you had no account with us, but that your London bankers were Darby, Drummond, and Rothenberg, Limited." "Quite right," Sir Charles murmured. "Two days later a lady, Madame Picardet, who was a customer of ours, brought in a good cheque for three hundred pounds, signed by a first-rate name, and asked us to pay it in on her behalf to Darby, Drummond, and Rothenberg's, and to open a London account with them for her. We did so, and received in reply a cheque-book." "From which this cheque was taken, as I learn from the number, by telegram from London," the Commissary put in. "Also, that on the same day on which your cheque was cashed, Madame Picardet, in London, withdrew her balance." "But how did the fellow get me to sign the cheque?" Sir Charles cried. "How did he manage the card trick?" The Commissary produced a similar card from his pocket. "Was that the sort of thing?" he asked. "Precisely! A facsimile." "I thought so. Well, our Colonel, I find, bought a packet of such cards, intended for admission to a religious function, at a shop in the Quai Massena. He cut out the centre, and, see here--" The Commissary turned it over, and showed a piece of paper pasted neatly over the back; this he tore off, and there, concealed behind it, lay a folded cheque, with only the place where the signature should be written showing through on the face which the Seer had presented to us. "I call that a neat trick," the Commissary remarked, with professional enjoyment of a really good deception. "But he burnt the envelope before my eyes," Sir Charles exclaimed. "Pooh!" the Commissary answered. "What would he be worth as a conjurer, anyway, if he couldn't substitute one envelope for another between the table and the fireplace without your noticing it? And Colonel Clay, you must remember, is a prince among conjurers." "Well, it's a comfort to know we've identified our man, and the woman who was with him," Sir Charles said, with a slight sigh of relief. "The next thing will be, of course, you'll follow them up on these clues in England and arrest them?"