"I'm sure of it," said he; "it's a round square in the shape of an oblong, and one hundred and ninety two is at the side near Durham something or other; we can watch it easily from the palings."
After this, ten minutes' drive brought us to the place, and I found it as he had said, the "square" being really a triangle. Number one hundred and ninety two was a big house, its outer points gone much to decay, but lighted on its second and third floors; though so far as I could see, for the blinds of the drawing-room were up, no one was moving. This did not deter me, however, and, taking my stand with Abel at the corner where two great trees gave us perfect shelter, we waited silently for many minutes, to the astonishment of the constable upon the beat, with whom I soon settled; and to his satisfaction.
"Ah," said he, "I knew they was rum 'uns all along; they owe fourteen pounds for milk, and their butcher ain't paid; young men going in all night, too—why, there's one of them there now."
I looked through the trees at his words, and saw that he was right. A youth in an opera hat and a black coat was upon the doorstep of the house; and as the light of a street lamp fell upon his face, I recognized him. He was the boy who had eaten of the jam-tarts so plentifully at Lady Faber's—the youth with whom Sibyl Kavanagh had pretended to have no acquaintance when she talked to me in the conservatory. And at the sight of him, I knew that the moment had come.
"Abel," I said, "it's time you went. Tell the men to bring a short ladder with them. They'll have to come in by the balcony—but only when I make a sign. The signal will be the cracking of the glass of that lamp you can see upon the table there. Did you bring my pistol?"
"Would I forget that?" he asked; "I brought you two, and look out! for you may want them."
"I know that," said I, "but I depend upon you. Get back at the earliest possible moment, and don't act until I give the signal. It will mean that the clue is complete."
He nodded his head, and disappeared quickly in the direction where the carriage was; but I went straight up to the house, and knocked loudly upon the door. To my surprise, it was opened at once by a thick-set man in livery, who did not appear at all astonished to see me.
"They're upstairs, sir, will you go up?" said he.
"Certainly," said I, taking him at his word. "Lead the way."