"But London is full of old Australians," objected Langholm, for objection's sake.
"Well, sir," laughed the officer, "you find one who carries a revolver like this, and prove that he was in Chelsea on the night of the murder, with a motive for committing it, and we shall be glad of his name and address. Only don't forget the motive; it wasn't robbery, you know, though her ladyship was so sure it was robbers! There's the maker's name on the barrel. I should take a note of it, sir, if I was you!"
That name and that note were all that Langholm had to show when he dined with the criminologist at his service club the same evening. The amateur detective looked a beaten man already, but he talked through his teeth of inspecting the revolvers in every pawnbroker's shop in London.
"It will take you a year," said the old soldier, cheerfully.
"It seems the only chance," replied the despondent novelist. "It is a case of doing that or nothing."
"Then take the advice of an older fogey than yourself, and do nothing! You are quite right to believe in the lady's innocence; there is no excuse for entertaining any other belief, still less for expressing it. But when you come to putting salt on the real culprit, that's another matter. My dear fellow, it's not the sort of thing that you or I could hope to do on our own, even were the case far simpler than it is. It was very sporting of you to offer for a moment to try your hand; but if I were you I should confess without delay that the task is far beyond you, for that's the honest truth."
Langholm walked back to his hotel, revolving this advice. Its soundness was undeniable, while the source from which it came gave it exceptional weight and value. It was an expert opinion which no man in his senses could afford to ignore, and Langholm felt that Mrs. Steel also ought at least to hear it before building on his efforts. The letter would prepare her for his ultimate failure, as it was only fair that she should be prepared, and yet would leave him free to strain every nerve in any fresh direction in which a chance ray lit the path. But it would be a difficult letter to write, and Langholm was still battling with the first sentence when he reached the Cadogan.
"A gentleman to see me?" he cried in surprise. "What gentleman?"
"Wouldn't leave his name, sir; said he'd call again; a foreign gentleman, he seemed to me."
"A delicate-looking man?"