And in truth he was. He could pursue the most delicate investigations without giving himself away for a second.

“Well, now, you haven’t given me an inkling of what’s up yet, and you know I’m not fond of working in the dark. Why this sudden interest in Mrs. Morrice’s past?”

Lane was not addicted to telling more than he could help, for secrecy had become an ingrained habit with him. But the young man was a bit touchy on some things. He was especially so on the point that perfect confidence should be reposed in him, and it must be admitted that that confidence was never abused. He was a perfectly honourable young fellow, and his word was better than the bond of a good many people.

So Lane told him the salient details of the robbery in Deanery Street, ending with the remarkable discovery of the finger-prints of “Tubby” Thomas, and the incarceration of that accomplished criminal.

The quick mind of Sellars speedily grasped the complicated nature of this puzzling case. “By Jove, it wants a bit of thinking out, doesn’t it, Lane? In the meantime, according to your invariable custom, you are suspecting everybody, including Mrs. Morrice; the secretary, of course, and Morrice himself, and naturally the Brookes’s, uncle and nephew.”

Lane smiled. “I intend to know everything I can about every one of them. I exclude the servants, it is too deep a job for any of them.”

“And what about that pretty girl, the niece, what’s her name—eh, Miss Sheldon? You’ve got your eye on her, of course?” He spoke in rather a joking manner, for he often rallied Lane on his tendency to reverse the usual principle of British law and believe everybody to be guilty till his innocence was fully established.”

“She is a very charming young lady,” replied the detective a little grimly, for he did not relish being chaffed. “But I shall certainly not exclude her from the scope of my investigations if all others fail. Well now, look here, Mr. Sellars, I expect it will take you a little time to get at Mrs. Morrice’s history. What do you know about this Clayton-Brookes and his nephew? The uncle is a great racing man, I understand, and you are amongst the racing set.”

“I know Sir George just a little, we nod to each other when we meet, but I don’t think I have exchanged half a hundred words with him in my life. Archie Brookes I know about as well. But I can tell you this, he is not popular; most people think him a bit of a bounder. Do you want me to investigate in that quarter too?”

“Yes, I wish you to find out all you can. I want you to discover particularly what is known about the young man’s father who, according to what we are told, married Mrs. Morrice’s sister.”