"The police," the spook-like creature broke in with a sharp cackle, "know more in this case than you give them credit for. They know well enough the solution of the puzzle which appears so baffling to the public, but they have not sufficient proof to effect an arrest. At one time they hoped that the scoundrels would presently make a false move and give themselves away, in which case they could be prosecuted for defrauding the Smithsons of ten thousand pounds, but this eventuality has become complicated through the master-stroke of genius which made Henry Carter marry Louisa Smithson." "Henry Carter?" I exclaimed. "Then you do think the Carters had something to do with the case?" "They had everything to do with the case. In fact, they planned the whole thing in a masterly manner." "But the Russian Prince at Monte Carlo?" I argued. "Who was he? If he was a confederate, where has he disappeared to?" "He is still engaged in free-lance journalism," the Old Man in the Corner replied drily, "and in his spare moments changes parcels of French currency back into English notes." "You mean the brother!" I ejaculated with a gasp. "Of course I mean the brother," he retorted dryly, "who else could have been so efficient a collaborator in the plot? John Carter was comparatively his own master. He lived with Henry in the small house in Chelsea, waited on by a charwoman who came by the day. It was generally given out that his reporting work took him frequently and for lengthened stays out of London. The brothers, remember, had inherited a few hundreds from their father, while the Smithsons had inherited a few thousands. We must suppose that the idea of relieving the ladies of those thousands occurred to them as soon as they realised that Louisa, egged on by her mother, would cold-shoulder her fiancé. "John Carter, mind you, must be a very clever man, else he could not have carried out all the details of the plot with so much sang-froid. We have been told, if you remember, that he had early in life cut his stick and gone to seek fortune in London, therefore the Smithsons, who had never been out of Folkestone, did not know him intimately. His make-up as the Prince must have been very good, and his histrionic powers not to be despised: his profession and life in London no doubt helped him in these matters. Then, remember also that he took very good care not to be a great deal in the Smithsons' company--even in Monte Carlo he only let them see him less than half a dozen times, and as soon as he came to England he hurried on the wedding as much as he could.