FIVE years had passed since the Ithuriel had vanished like a cloud from the sky, leaving, so far as the air-ship itself was concerned, no more trace than if she had soared into space beyond the sphere of the earth’s attraction and departed to another planet.

All the rest of the winter of 2030-1, tidings had been sought most anxiously, but in vain, by the kindred and friends of those who had formed her crew during the ill-fated voyage on which she had disappeared into the unknown. The earth had been ransacked east and west, north and south, by the aerial fleet in search of the missing Ithuriel, but without result.

She had been traced to St. Petersburg and Vorobièvo?, but there, like the phantom craft of the Flying Dutchman, she had melted into thin air so far as any result of the search could show. But when the snows thawed on the mountains of Norway, and the bodies of eight Aerians who had formed her crew on her last fatal voyage were discovered by a couple of foresters in a melting snowdrift on the very spot on which Vladimir Romanoff had been killed with his companions by order of the Supreme Council, a thrill both of horror and excitement ran through the whole civilised world.

That their death was intimately connected with the disappearance of the air-ship was instantly plain to everyone, and the only inference which could be drawn from such a[76] conclusion was that at last some power, silent, mysterious, and intangible, had come into existence prepared to dispute the empire of the world with the Aerians, and, more than this, had already struck them a deadly blow which it was utterly beyond their power to return.

The effects of this discovery were exactly what Olga had anticipated. From the first time since their ancestors had conquered the earth and made war impossible, the supreme authority of the Aerians was called into question. It was quite beyond their power to conceal the fact that their flagship had either deserted or been captured, incredible as either alternative seemed. The Central Council therefore wisely accepted the situation, and immediately after the discovery of the bodies the President published a full account of her last voyage, as far as was known, in the columns of The European Review, the leading newspaper of the day in the Old World.

The only clue to the fate of the air-ship seemed to lie in the fact that at St. Petersburg a youth and young girl with whom Alan and Alexis had made friends on their journey from London had gone on board the Ithuriel for a trip to the clouds. But this led to nothing. Who was to recognise the daughter of the Tsar and the last male scion of the House of Romanoff in Olga and Serge Ivanitch, who had never been known as anything but the orphan grandchildren of Paul Ivanitch, the sculptor.

More than this, even to entertain for a moment the supposition that this boy and girl—for they were known to be little more—could by any possible means have overcome the ten Aerians, armed as they were with their terrible death-power, and then have vanished into space with the air-ship would have been to shatter the supremacy of the Aerians at a blow.

Even as it was, the wildest and most dangerous rumours began to fly from lip to lip and nation to nation all round the world, and for the first time since the days of the Terror the “Earth Folk” began to think of the Aerians rather as men[77] like themselves than as the superior race which they had hitherto regarded them.

The President of Aeria at once issued a proclamation asking, in the interests of peace and public security, for the assistance of all the civilised peoples of the earth in his efforts to discover the lost air-ship, and also conditionally declaring a war of extermination on any Power or nation which either concealed the whereabouts of the Ithuriel or gave any assistance to those who might be in possession of her. This proclamation was published simultaneously in all the newspapers of the world, and produced a most profound sensation wherever it was read.

The terrible magic of the ominous word “war” roused at once the deathless spirit of combativeness that had lain dormant for all these years. It was impossible not to recognise the fact that this mysterious power, which had come unseen into existence and had snatched the finest vessel in the Aerian navy from the possession of the Council with such daring and skill that not a trace of her was to be found, could have but one object in view, and that was to dispute the Empire of the Air with the descendants of the Terrorists.

This could mean nothing else than the outbreak, sooner or later, of a strife that would be a veritable battle of the gods, a struggle which would shake the world and convulse human society throughout its whole extent. The general sense of peace and security in which men had lived for four generations was shattered at a stroke by the universal apprehension of the blow that all men felt to be inevitable, but which would be struck no man knew when or how.

A year passed, and nothing happened. The world went on its way in peace, the Aerian patrols circled the earth with a moving girdle of aerial cruisers, ready to give instantaneous warning of the first reappearance of the lost Ithuriel; but nothing was discovered. If she still existed, she was so skilfully concealed as to be practically beyond the reach of human search.

Then without the slightest warning, while Anglo-Saxondom[78] was in the midst of the hundred and thirtieth celebration of the Festival of Deliverance, the civilised world was started out of the sense of security into which it had once more begun to fall by the publication, in The European Review, of the following piece of intelligence:—

    A MYSTERY OF THE SEA.

    Disappearance of Three Transports.

    It is our duty to chronicle the astounding and disquieting fact that the three transports, Massilia, Ceres, and Astr?a, belonging respectively to the Eastern, Southern, and Western Services, have disappeared.

    The first left New York for Southampton four days ago, and should have arrived yesterday. The Central Atlantic signalling station reported her “All well” at midday on Tuesday, and this is the last news that has been heard of her. The second was reported from Cape Verd Station on her voyage from Cape Town to Marseilles, and there all trace of her is lost, as she never reached the Canary Station. The third was last heard of from Station No. 2 in the Indian Ocean, which is situated at the intersection of the 80th meridian of east longitude with the 20th parallel of south latitude; she was on her way from Melbourne to Alexandria, and should have touched at Aden two days ago.

    The disappearance of these three magnificent vessels, filled as they were with passengers and loaded with cargoes of enormous value both in money and material, can only be described as a calamity of world-wide importance. Unhappily, too, the mystery which surrounds their fate invests it with a sinister aspect which it is impossible to ignore.

    That their loss is the result of accident or shipwreck it is almost impossible to believe. They represented the latest triumphs of modern shipbuilding. All were over forty thousand tons in measurement, and had engines capable of driving them at a speed of fifty nautical miles an hour through the water.

    For fifty years no ocean transport has suffered shipwreck or even serious injury, so completely has modern engineering skill triumphed over the now conquered elements. Added to this, no storms of even ordinary violence have occurred along their routes. After passing the stations at which they were last reported, they vanished, and that is all that is known about them.

    The President of Aer............