“Beware that the Blue Rajah is not stolen on Wednesday the 13th inst. Do not lose sight of it for one moment. “Your Lordship’s obedient servant, “Moris Klaw.” “You see,” continued Grimsby, “Wednesday the thirteenth is to-morrow, when the thing is being brought to Moorgate Street. Naturally, Sir Michael communicated with the Yard, and as I’m in the know about Moris Klaw, I got the job of looking into the matter. I was at the Mansion House this morning.” “I suppose Sir Michael regards this note with suspicion?” “Well, he’s not silly enough to suppose that anybody who thought of stealing the diamond would drop him a line advising him of the matter! But he’d never heard of Moris Klaw until I explained about him. When I told him that Klaw had a theory about the Cycle of Crime, and his letter probably meant that, according to said theory, on Wednesday the thirteenth the Blue Rajah was due to be lifted, so to speak, he laughed. You’ll have noticed that people mostly laugh at first about Moris Klaw?” “Certainly. You did, yourself!” “I know it--and I’m suffering for it! Klaw won’t lift his little finger when I ask him; and as for his daughter, she giggles as though she was looking at a comedian when she looks at _me!_ She thinks I’m properly funny!” “You’ve been to Wapping, then?” “Yes, this afternoon. The Lord Mayor wanted a lot of convincing that Moris Klaw was on the straight after I’d told him that the old gentleman was a dealer in curios in the East End. Finally, he suggested that I should find out what the warning meant exactly. But I couldn’t get to see Klaw; his daughter said he was out.” “I suppose every precaution will be taken?” “To-morrow morning we have arranged that I and two other C.I.D. men are to accompany the party to the safe deposit vaults to fetch the diamond and we shall guard it on the way back afterward.” “Who’s going to fetch it?” “Sir John Carron, representing the India Office, Mr. Mark Anderson--the expert--representing the city, and Mr. Gautami Chinje, representing the Gaekwar of Nizam. I was wondering”--he surveyed the burning end of his cigarette--“if you had time to run down to Wapping yourself and find out from what direction we ought to look for trouble?” “Sorry, Grimsby,” I replied; “I would do it with pleasure, but my evening is fully taken up. Personally, it appears to me that Moris Klaw’s warning was a timely one. You seem to be watching the stone pretty closely.” “Like a cat watches a mouse!” he rapped. “If any one steals the Blue Rajah to-morrow, he’ll be a clever fellow.” II