"I'm going along in order," answered Burchill coolly. "Well, I come to the time when Davidge there arrested Barthorpe and myself at Halfpenny and Farthing's, and when I escaped. There's no need to tell you what I did with myself," he went on, with an obvious sneer in the detective's direction. "But I can tell you that I didn't particularly restrict my movements. And eventually--a few days ago--I come into touch with Dimambro, who had returned to England. As I said before, we had met during the time I was secretary to Jacob Herapath. Dimambro, when I met him--accidentally--was on his way to the police, to tell them what he knew. I stopped him--he told his story to me instead. I told him mine. And the result of our deliberations was that we got an interview--at least I did--with Mrs. Engledew here, with respect to the diamonds which she had entrusted to Jacob Herapath. And----" "I should like to ask you a question, Mrs. Engledew," said Cox-Raythwaite, interrupting Burchill without ceremony. "Why did you not inform the police about your diamonds as soon as you heard of the murder?" Mrs. Engledew betrayed slight signs of confusion, and Davidge gave the questioner a look. "I think if I were you, I shouldn't go into that matter just now, Professor," he said apologetically. "Ladies, you know, have their reasons for these little--what shall we call 'em?--peculiarities. No, I wouldn't press that point, sir. We're having a nice, straight story--quite like a printed one!--from Mr. Burchill there, and I think we'd better let him come to what we may term the last chapter in his own way--what?" "I'm at the last chapter," said Burchill. "And it's a short one. I saw Mrs. Engledew and made certain arrangements with her. And just after they were made--yesterday in fact--Dimambro and I got a new piece of evidence. When Dimambro was collecting those pearls for Jacob Herapath he bought some from a well-known dealer in Amsterdam, a specialist in pearls. Yesterday, Dimambro got a letter from this man telling him that a small parcel of those very pearls had been sent to him from London, for sale. He gave Dimambro the name and address of the sender, who, of course, was the Mr. X. of whom I have spoken. So then Dimambro and I resolved to act, through Mrs. Engledew----" "For a slight consideration, I think," suggested Davidge dryly. "A matter of a little cheque, I believe, Mr. Burchill." "We've quite as much right to be paid for our detective services, amateur though they are, as you have for yours, Davidge," retorted Burchill. "However, I've come to an end, and it only remains for me to tell you who Mr. X. really is. He hasn't the slightest notion that he's suspected, and if you and your men, Davidge, go round to his house, which isn't half a mile away, you'll probably find him eating his Sunday evening supper in peace and quietness. The man is----"