"You don't say so?" he said quietly. "Do you not call it a positive fact that the bank safe was robbed of £5000 on the evening of March 25th before 11.30 p.m."
"Yes, that is all which is positive and—"
"Do you not call it a positive fact," he interrupted quietly, "that the lock of the safe not being picked, it must have been opened by its own key?"
"I know that," she rejoined crossly, "and that is why every one agreed that James Fairbairn could not possibly—"
"And do you not call it a positive fact, then, that James Fairbairn could not possibly, etc., etc., seeing that the glass partition door was locked from the inside; Mrs. Ireland herself let James Fairbairn into her husband's office when she saw him lying fainting before the open safe. Of course that was a positive fact, and so was the one that proved to any thinking mind that if that safe was opened with a key, it could only have been done by a person having access to that key."
"But the man in the private office—"
"Exactly! the man in the private office. Enumerate his points, if you please," said the funny creature, marking each point with one of his favourite knots. "He was a man who might that night have had access to the key of the safe, unsuspected by the manager or even his wife, and a man for whom Mrs. Ireland was willing to tell a downright lie. Are there many men for whom a woman of the better middle class, and an Englishwoman, would be ready to perjure herself? Surely not! She might do it for her husband. The public thought she had. It never struck them that she might have done it for her son!"
"Her son!" exclaimed Polly.
"Ah! she was a clever woman," he ejaculated enthusiastically, "one with courage and presence of mind, which I don't think I have ever seen equalled. She runs downstairs before going to bed in order to see whether the last post has brought any letters. She sees the door of her husband's office ajar, she pushes it open, and there, by the sudden flash of a hastily struck match she realizes in a moment that a thief stands before the open safe, and in that thief she has already recognized her son. At that very moment she hears the watchman's step approaching the partition. There is no time to warn her son; she does not know the glass door is locked; James Fairbairn may switch on the electric light and see the young man in the very act of robbing his employers' safe.
"One thing alone can reassure the watchman. One person alone had the right to be there at that hour of the night, and without hesitation she pronounces her husband's name.