"Perhaps not, Mr. Denzil; but where do those he sees come from?"
"How do you mean, Miss Greeb?"
"They don't go in by the front door, that's certain," continued the little woman darkly. "There's only one entrance to this square, sir, and Blinders, the policeman, is frequently on duty there. Two or three nights he's met Mr. Berwin coming in after dark and exchanged friendly greetings with him, and each time Mr. Berwin has been alone!"
"Well! well! What of that?" said Denzil impatiently.
"This much, Mr. Denzil, that Blinders has gone round the square, after seeing Mr. Berwin, and has seen shadows—two or three of them—on the sitting-room blind. Now, sir," cried Miss Greeb, clinching her argument, "if Mr. Berwin came into the square alone, how did his visitors get in?"
"Perhaps by the back," conjectured Lucian.
Again Miss Greeb shook her head. "I know the back of No. 13 as well as I know my own face," she declared. "There's a yard and a fence, but no entrance. To get in there you have to go in by the front door or down the aiery steps; and you can't do neither without coming past Blinders at the square's entrance, and that," finished Miss Greeb triumphantly, "these visitors don't do."
"They may have come into the square during the day, when Blinders was not on duty."
"No, sir," said Miss Greeb, ready for this objection. "I thought of that myself, and as my duty to the square I have inquired—that I have. On two occasions I've asked the day policeman, and he says no one passed."
"Then," said Lucian, rather puzzled, "Mr. Berwin cannot live alone in the house."