He was told, of course, no more than was necessary. He was not by any means in our full confidence. But he was given a part to play, and promised a reward, if he played it well, that would make him independent for life. Let me say at once that he fulfilled his duty with admirable skill, and, when he received his check from Mr. Morse, vanished forever from our ken. I have no doubt that he is spying somewhere or other on the globe at this moment, but I have no ambition to meet him again. Mr. Sliddim, considerably furbished up in personal appearance, was made caretaker at Birmingham House in Berkeley Square. He had not been in that responsible position for more than ten days when our fish began to nibble at the bait. In a certain little public house by some mews at the back of Berkeley Square, a little public house which Mr. Sliddim was instructed--and needed no encouragement--to frequent, he was one day accosted by a tall, middle-aged man with a full, handsome face and a head of curling, gray hair. This man was dressed in a seedy, shabby-genteel style, and soon became intimate with our lure. Certainly, to give him his due, Sliddim must have been a supreme actor in his way. He did the honest, but intensely stupid caretaker to the life. Mark Antony Midwinter was completely taken in and pumped our human conduit for all he was worth, until he was put in possession of an entirely fictitious set of circumstances, arranged with the greatest care to suit my plans. I shall not easily forget the evening when Sliddim slunk into my dining-room and described the scene which told us we had made absolutely no mistake and that our fish was definitely hooked. It seems that the good Sliddim had gradually succumbed to the repeated proffer of strong waters on the part of "Mr. Smith," his new friend. He had bragged of his position, only lamenting that some days hence it was to come to an end, when, in the evening, Mr. Mendoza Morse, his daughter, and a staff of servants were to enter the house simultaneously. Sliddim, the most consistent whisky-nipper I have ever seen--and I had some curious side-lights on that question when I was landlord of the "Golden Swan"--was physically almost incapable of drunkenness, but he simulated it so well in the little pub at the back of the Square that Mark Antony Midwinter made no ado about taking the latchkey of Birmingham House area door from his pocket and making a waxen impression of it. Rolston and I knew that we were "getting very hot," as the children say when they are playing Hunt-the-Slipper, and another visit from Sliddim confirmed it. The plan of our enemy was perfectly clear to our minds. He would enter the house by means of the key an hour or two before Morse and the servants were due, conceal himself within it, and do what he had to do in the silent hours of the night.