"Yes. I've just come back from Cambridge. I left here this morning as soon as it was light--" Eastwell, in his aviator's leather jacket, fur helmet and goggles, presented a tall, gaunt, rather uncouth figure. Yet, in his ordinary clothes, he was something of a dandy, with light brown hair, a carefully-trained moustache, and a pair of shrewd grey eyes. Roseye had been acquainted with him for over two years, and it was she who had first introduced us. They had met at Wiesbaden, where her father, Sir Herbert, had been taking his annual "cure." Eastwell had been at the Kaiserhof Hotel where they had also been staying and, being a young Englishman of means and leisure, an acquaintanceship had sprung up between them. Lionel Eastwell was a great lover of music, and for that reason had been at Wiesbaden, where, in the Kursaal, the programme in the pre-war days was always excellent. On their return to London Eastwell called at Cadogan Gardens, and Sir Herbert had then ascertained that the pleasant young man--who for two years had taken such a great interest in aviation--was possessed of a very comfortable income, was a member of the aero club, and lived in a very snug set of chambers half-way up Albemarle Street. At the Royal Automobile Club he was also a well-known figure in the select circle of rather go-ahead airmen who made that institution their nightly rendezvous. As a result of hearing Lionel Eastwell speak of the pleasures and exhilaration of the air, and after watching his flights at Hendon, Roseye had at last determined to seek the new sensation of aerial navigation, and in taking her lessons she and I had met. Airmen and airwomen form a very select coterie practically unknown to the world outside the aerodrome. They fly; they risk their lives; they make their daily experiments with their new engines, new wings, new airscrews, new strainers, new magnetos, and all sorts of newly-invented etceteras, all the time risking their lives in a bad nose-dive, or with a buckled wing. Our quartette, all of us enthusiasts, and all holding our own views regarding the British supremacy of aerial navigation in the war, stood chatting for ten minutes, or more, until turning to Roseye, I said: "Well, I'm going over to see what Theed is up to." Then, together, we left Eastwell to go back to his own machine. Yet, in that second, a strange thing occurred. Perhaps I may have been unduly suspicious--if so, I regret it and offer apology--but I felt certain somehow that I saw in Roseye's face a look of displeasure that I should have taken her from the man whose sudden appearance had caused her countenance to brighten. And, at the same time, as I glanced surreptitiously at Lionel Eastwell, while in the act of offering him a "gasper" from my case, I most certainly saw a strange and distinctly sinister expression--one that caused me through the next hour to reflect very deeply, and ponder over its cause. CHAPTER TWO. THE MURDER-MACHINES.