Then and not until then, Kearns gave the word and the King and Queen, accompanied by their respective suites, returned to the Summer Palace. This return took place while there were yet three nights left of the waning moon--just in the nick of time, as Kearns put it. There was, however, one matter troubling Kearns. The necessity of secrecy and also of compactness of construction had been such that it had only been possible to construct an air-ship of very moderate dimensions--an air-ship equipped to carry only two persons. Now, one of these persons must necessarily be Professor Dean, since he alone was competent to navigate the aërial craft. Who was to be the other passenger? Equally obviously--as Kearns himself was compelled regretfully to admit--it could not be Kearns. In following the attacking party, it was impossible to predict what situations might be encountered or what exigencies might arise. To cope properly with these situations and meet these exigencies, necessarily required some person who was familiar with existing conditions and customs, otherwise the whole pursuit might result in failure and the marauders escape. A man who had only recently excited the risibilities and the wonderment of rustics by inquiring for a horse and carriage was hardly the right man for the task. Sadly and with woebegone mien, Kearns had to concede it. The solitary passenger accompanying the Professor must be a man familiar with existing conditions--a man of authority, of resource and of courage. Casting about them for a selection, neither Kearns nor the Professor could think of any person possessing better qualifications for the work in hand than Captain Stanley Mortimer, of the Imperial Guard. Following upon Beatrice’s introduction and the Captain’s invitation to visit his quarters, they had both formed his acquaintance; he had shown them various little attentions and kindnesses; both were impressed with him. But Captain Mortimer’s military duties as an officer of the Guard might possibly interfere with his movements on the critical night. There must also be a substitute, in case of emergency, and naturally they selected Captain Mortimer’s comrade, Captain Ralph Swords. Reluctantly, therefore, Kearns consented and the subject was broached to the two officers, under strictest promise of secrecy. To no one must they breathe one word of the expedition, neither before nor after the event, until relieved from their respective promises by Mr. Kearns. Both eagerly consented to embark upon what promised to be at least an interesting adventure. They had contemplated leaving the Imperial Guard and exchanging into another regiment, but in view of this adventure they decided to postpone matters. Following his customary methods, Kearns communicated these selections to no one--not even to the King. Mr. Kearns liked to deal only in results.