French nodded, and reverting to the description, tried for some further details with which to augment it. Though he had complimented Stanley on it, he realised that as it stood it was of little use. But the young man was unable to improve on his former effort and French was about to thank the two men and leave the shop when Stanley chanced to drop a phrase which sent the detective into a white heat of excitement and made him marvel at Chief Inspector Mitchell’s perspicacity and his own obtuseness. “And there was nothing in the slightest degree out of the ordinary in the whole transaction, no matter how trivial?” he had asked as a sort of general finale to his catechism, more as a matter of form than because he hoped to gain any information, and it was in reply that the assistant, after saying: “No, sir, I don’t think so,” had pronounced the priceless words: “Unless you would call changing a large note out of the ordinary. The man hadn’t enough loose change to make up the thirty-five shillings and he asked me to change a twenty-pound note.” “What!” roared French with a delighted oath, springing to his feet in his excitement. So that was it! He saw it all now! Like a flash this whole mysterious business of the wedding rings became clear as day. And the Chief had guessed! Moreover the Chief had given him a broad hint and he, like the _ass_ that he was, had missed its meaning! He sat down and wiped his forehead. Who was this mysterious individual, this dark-haired man with moustache and glasses, but Roper! Roper it was who had been going about buying wedding rings, and Roper it was who naturally found that he must get rid of such incriminating purchases at the earliest possible moment. The whole thing was clear! For every ring a £20 note, a tainted £20 note, a £20 note from Mr. Averill’s wrecked safe up at Starvel. And for every £20 note got rid of over £18 of good, clean, untraceable money brought in. It was a scheme, a great scheme, worthy of the man who had devised the crime as a whole.