Night was falling, and Naples Harbour, always picturesque, appeared even more so than usual in the warm light of the departing day. The city itself, climbing up the hillside, almost from the water's edge, was coloured a pale pink by the sunset, and even old Vesuvius, from whose top a thin column of black smoke was issuing, seemed somewhat less sombre than usual. Out Ischiawards, the heavens were a mass of gold and crimson colouring, and this was reflected in the calm waters of the Bay, till the whole world was a veritable glow. Taken altogether, a more beautiful evening could scarcely have been desired. And yet it is not with the city, the mountain, or the sunset, that we have to do, but with the first movement of a conspiracy that was destined ultimately to shake one of the greatest Empires, the earth has ever seen, to the very foundations of its being.Though the world was not aware of it, and would not, in all human probability, have concerned itself very much about it even if it had, the fact remains that for some hours past two men, from a house situated on one of the loftiest pinnacles of the city, had been concentrating their attention, by means of powerful glasses, upon the harbour, closely scrutinizing every vessel that entered and dropped her anchor inside the Mole."Can anything have happened that she does not come?" asked the taller of the pair, as he put down his glasses, and began to pace the room. "The cable said most distinctly that the steam yacht, Princess Badroulbadour passed through the Straits of Messina yesterday at seven o'clock. Surely they should be here by this time?"