At the sound of such names as these I was almost appalled at the outset. The character of the Dowager Empress, as much as her rank, rendered her unapproachable. M. Pobiedonostzeff, although a bigot, was not likely to be a traitor. The Grand Duke was an unknown quantity, as far as I was concerned, but it did not seem very probable that a personage in his position would prove accessible to a bribe.

It never does to despair too soon. I put the question which long experience of the dark side of human nature has rendered habitual with me—

‘Has the Grand Duke any vices?’

‘He gambles a good deal in the Yacht Club.’

I drew a breath of satisfaction. Of all men the gambler is the easiest to corrupt, because to him alone money is everything, and because there comes a time to every gambler when money is not to be had.

‘Who are his gambling companions?’ was my next question.

The Ambassador named several Russian nobles of high rank, among whom the leading spirit seemed to be a Prince Boris Mendelieff. I was going on with my inquiries when his Excellency checked me.

‘I have told you enough, it seems to me, to enable you to go on by yourself. In the meantime I am the Ambassador of the Sultan, not his secret service agent, and I wish to know nothing that might compromise me.’

I respected his scruples, though they were such as some Russian diplomatists would scarcely have understood, and proceeded to form my own plans for making the acquaintance of Prince Mendelieff.

Fortunately the Russians are as unsuspicious in private life as they are suspicious in politics. My skill as a bridge-player, a game in which I have no living superior, proved a ready passport into the gaming circles of Petersburg, and it was not long before I found myself sitting at the same card-table with the intimate of the Grand Duke.