"It is believed by the research engineers of the government that, though their headquarters may be located at a great distance, the raiders drop to a comparatively low altitude at the time of one of their attacks, returning immediately thereafter to their base." Hart Jones shook his head. "The engineers may be correct," he stated; "but how on earth can you expect a little vessel like the _Pioneer_ to battle an enemy who is possessed of these terribly destructive weapons and who has sufficient confidence in his own invulnerability to declare war on the greatest country on earth?" * * * * * Secretary Simler dropped his voice to a confidential tone, and his keen gray eyes flashed excitement as he unfolded the details of the discoveries and plans of the War Department. We three listened in undisguised amazement to a tale of the unceasing labors of our Secret Service agents in foreign countries, of elaborate experiments with deadly weapons and the chemicals of warfare. We heard of marvelous new rays that could be projected for many miles and destroy whole armies at a single blast; rays that would, in less time than that required to tell of the feat, reduce to a mass of fused metal the greatest firstline battleships of the old days of ocean warfare. We heard of preparations for defensive warfare throughout the civilized world, preparedness that insured so terrible and final a war that it was literally impossible for a great world conflagration to again break out. We learned that the present mysterious signs of a coming war could not possibly have originated in any country on earth, else they would have been known of long in advance, due to the network of the Secret Service system. This war, so unexpectedly thrust upon us, was undoubtedly a war of planets! "But," objected Hart, "the messages were in English, were they not?" "They were," continued Secretary Simler, "and that puzzled our experts in the beginning. But, it may well be that our enemy from out the skies has had spies among us for many years and could thus have learned our languages and radio codes. In any event, we are to meet destructive rays with others equally destructive, and you, Hartley Jones, are the man who can make our effectiveness certain." "I?" "Yes. How long a time will be required in fitting out the _Pioneer_ for reliable space flying?" * * * * * Hart Jones pondered the matter and I could see that he was overjoyed at the prospect of getting into the thing in earnest. "About one week," he replied, "providing you can send a force of fifty expert mechanics to my hangar at once and supply all material as fast as I shall require it."