Chris turned away to something else. Bell completed his purchase, and together they left the shop. Once outside Chris gripped her companion's arm excitedly. "Another great discovery," she said. "Did you see me looking at that cigar-case--a gun-metal one set with diamonds? You recollect that Ruth Gates purchased a case like that for that--that foolishness we thought of in connection with Mr. Steel. The case had a little arrow shaped scratch with the head of the arrow formed of the biggest diamond. Enid told me all this the night before I left Longdean Grange. Dr. Bell, I am absolutely certain that I have had in my hand just now the very case bought by Ruth from Lockhart's in Brighton!" CHAPTER XXXVI A BRILLIANT IDEA Bell was considerably impressed with the importance of Chris's discovery, though at the same time he was not disposed to regard it in the light of a coincidence. "It's a useful discovery in its way," he said; "but not very remarkable when you come to think of it. Somebody with an eye to damaging Steel changed that cigar-case. How the change affected Steel you know as well as I do. But the cigar-case purchased by Ruth Gates must be somewhere, and we are as likely to find it near Reginald Henson as anywhere else, seeing that he is at the bottom of the whole business. That change was made either by himself or by somebody at his instigation. Once the change was made he would not bother about the spare cigar-case. His ally probably came here to see Henson; the latter as likely as not threw him over, knowing that the fellow would not dare to talk; hence the thing is turned into money. I am merely speculating, of course, under the assumption that you are quite sure of your facts." "Absolutely," Chris cried, eagerly. "Two long, irregular scratches leading up in arrow-headed shape to the big diamond in the centre. Ruth told Enid all about that the very last time they discussed the matter together." "How came Ruth Gates to remember it so clearly?" "Well, she did it herself. She was rubbing some specks off the case at the last moment, and the scratches were made accidentally with the stones in one of her rings." Bell was fain to admit that the discovery was an important one. "We'll leave it for the present," he said. "In a small place like this so valuable an article is likely to remain in stock for some time. I'll call in again to-morrow on the pretence of getting further goods and obtain all the information there is to be gained as to who sold the case and what he was like. There is just time for a little lunch before we take up our reverend friend. Where shall we go?" Chris would like to see the Lion. There was a marvellous coffee-room there with panelled walls and a ceiling by Pugin, and an Ingle-nook filled with rare Dutch tiles. They had the beautiful old place to themselves, so that they could talk freely. Chris crumbled her bread and sipped her soup with an air of deep abstraction.