A thought came directly, and it seemed so childish in its simplicity that he smiled and was ready to give it up; but it grew in strength and possibility as he looked round and took from a table, where lay quite a little heap that had been thrust into his letter-box from time to time, four or five unopened circulars and foolscap missives, whose appearance told what they were; and armed with these he opened his doors softly and passed out, drawing the outer door to, and then stole on tiptoe downstairs and out into the dimly lit square. "He will not notice that it is so late," he said to himself, as he looked up and saw just a faint gleam of light at Brettison's window, where the drawn curtain was not quite closed. Stratton paused for a moment, and drew a long breath before attempting to act the part upon which he had decided. Then, going on some twenty or thirty yards, he turned and walked back with a heavy, decided, businesslike step, whistling softly as he went, right to the entry, where, still whistling, he ascended the stairs to his door, thrust in and drew out a letter-packet thrice, making the metal flap of the box rattle, gave a sharp double knock, and then crossed the landing and went the few steps, whistling still, along the passage to Brettison's door. Here he thrust in, one by one, three circulars, with a good deal of noise, through the letter-flap, gave the customary double knock, went on whistling softly, and waited a moment or two; and then, as he heard a faint sound within, gave another sharp double rap, as a postman would who had a registered letter, or a packet too big to pass through the slit. The ruse was successful, and with beating heart Stratton stood waiting a little on one side, as there was the click and grate of the latch, and the door was opened a little way. That was enough. Quick as lightning, Stratton seized and dragged it wide, to step in face to face with Brettison, who started back in alarm and was followed up by his friend, who closed both doors carefully, and then stood gazing at the bent, grey-headed, weak old man, who had shrunk back behind the table, whereon the pipe stood burning slowly, while the unshaded lamp showed a dozen or so of freshly opened letters on the table, explaining their owner's visit there. Stratton did not speak, but gazed fiercely at the trembling old man, who looked wildly round as if for some weapon to defend himself, but shook his head sadly, and, with a weary smile, came away from his place of defence. "Your trick has succeeded, sir," he said quietly. "Seventy-two! Has the time come? I ought not to fear it now." Stratton uttered a harsh sound--half-gasp, half-cry. "Well," continued Brettison, who looked singularly aged and bent since they had last stood face to face, "you have found me at last." Stratton's lips parted, but no sound came; his emotion was too great.