Everyone in the room was deeply impressed. Indeed, no one could have failed to recognize in the speaker a man of powerful mind, one of penetrating and unusual intellect. “Had I had the good fortune to meet you, Mr. Klaw,” said the Lord Mayor, “I should have attached a greater, and--er--a different, significance to your note. Your theories are strange ones, but to-day they have received strange and ample substantiation. I can only hope--and I do so with every confidence in your great ability”--Moris Klaw rose and bowed--“that you will be able to recover the diamond whose loss you so truly predicted.” “I will ask you,” replied Moris Klaw, “to have sent in to me the black coffee. Myself, my daughter, Mr. Searles, and Mr. Grimsby will view the room from which the robbery took place.” “You would wish us to remain here?” asked Mr. Anderson, glancing at the others. “I would so wish it, yes.” “I hope, Mr. Klaw,” said Sir Michael Cayley, “that you will not hesitate to send me an account of your fee and expenditures.” “I shall not so hesitate,” replied Moris Klaw. IV We entered the small room from which the Blue Rajah had been spirited away. Grimsby, who was badly puzzled, was evidently glad of Klaw’s coöperation. Moris Klaw’s letter of warning, leading to the request for Moris Klaw’s attendance, had enabled the Scotland Yard man to summon that keen intellect to his aid without compromising his professional reputation. He would lose no credit that might accrue if the gem were recovered and, in short, was congratulating himself upon a diplomatic move. “It’s beyond me,” he said, “how the thing was got out of the room. With this door shut, the window fastened, and the other door double-locked, as it always is, practically the place is a box.” Moris Klaw, from its hiding place in the lining of his hat, took out the scent spray and squirted verbena upon his face. “A box--yes,” he rumbled; “and so stuffy. No air.” “There’s no ventilation,” explained Grimsby. “That square hole over the door is intended for ventilation, but as there’s no corresponding aperture over the window or elsewhere it’s useless. Anyway, it only opens on the passage.” “Ah. You searched them all quite thoroughly?” “Certainly; like Kaffirs. But I didn’t expect to find it.” “Blessed is he who expecteth little. Isis, my child, there is someone knocking.” Isis opened the door communicating with Mr. Anderson’s office, and a boy entered carrying a tray with a coffee pot and cup upon it.