Mr. Madgin never took any important step without first consulting his daughter.  Herein he acted wisely, for Mirpah’s clear, good sense, and feminine quickness at penetrating motives where he himself was sometimes at fault, had often proved invaluable to him in difficult transactions.  In a matter of so much moment as that of the Great Hara Diamond it was not likely that he would be long contented without taking her into his confidence.  He had scarcely finished his first pipe when he heard her opening the door with her latch-key, and his face brightened at the sound.  She had been on one of those holy pilgrimages in which all who are thus privileged take so much delight:  she had been to the bank to increase the little store which lay there already in her father’s name.  She came into the room tired but smiling.  A white straw bonnet, a black silk mantle, and a muslin dress, small in pattern, formed the chief items of her quiet attire.  She was carefully gloved and booted; but to whatever she wore Mirpah imparted an air of distinction that put it at once beyond a suggestion of improvement.

“Smoking at this time of day, papa!” exclaimed Mirpah.  “And the whisky out, too!  Are we about to retire on our fortunes, or what does it all mean?”

“It means, child, that I have got one of the hardest nuts to crack that were ever put before me.  If I crack it, I get five thousand pounds for the kernel.  If I don’t crack it—­but that’s a possibility I can’t bear to think about.”

“Five thousand pounds!  That would indeed be a kernel worth having.  My teeth are younger than yours, and perhaps I may be able to help you.”

Mr. Madgin smoked in silence for a little while, while Mirpah toyed patiently with her bonnet strings.  “The nut is simply this,” said the old man at last.  “In India, twenty years ago, a diamond was stolen from a dying man.  I am now told to find the thief, to obtain from him the diamond either by fair means or foul—­supposing always that he is still alive and has the diamond still in his possession—­and on the day I give the stone to its rightful owner the aforementioned five thousand pounds become mine.”

“A grand prize, and one worth striving for!”

“Even so; but how can I strive, when I have nothing to strive against?  I am like a man put into a dark room to fight a duel.  I cannot find my antagonist.  I grope about, not knowing whether he is on the right hand of me or the left, before me or behind me.  In fact, I am utterly at sea; and the more I think about the matter the more hopelessly bewildered I seem to become.”

“Two heads are better than one, papa.  Let me try to help you.  Tell me the case from beginning to end, with all the details as they are known to you.”

Mr. Madgin willingly complied, and related in extenso all that he had heard that morning at Deepley Walls.  The little man had a high opinion of his daughter’s sagacity.  That such an opinion was in nowise lessened by the result of the present case will be best seen by the following excerpts from Mr. Madgin’s diary, which, as having a particular bearing on the case of the Great Hara Diamond, we proceed at once to lay before the reader:—­