Sir Reginald Fosterdyke had been Bramsdean’s and Kenyon’s O.C., or, to employ service phraseology, a Wing-Commander. On his demobilisation he went to live at Air Grange, a large old-world house standing on high ground, a good five miles from Blandford. Very rarely he left his country-house; his visits to town were few and far between, and his friends wondered at the reticence of the versatile and breezy Fosterdyke. He seldom wrote to anyone. When he did, his correspondence was brief and to the point. More frequently he telegraphed--and then he meant business. In pre-war days Air Grange was famous for its week-end house parties. The shooting, one of the best in the county of Dorset, was an additional source of attraction to Fosterdyke’s guests. But the war, and afterwards, had changed all that. Few, very few, guests were to be found at Air Grange; the staff of servants was greatly reduced, the well-kept grounds developed a state of neglect. Sir Reginald’s friends came to the conclusion that the baronet had become "mouldy." They wondered what possessed him to live an almost hermit-like existence. Fosterdyke knew their curiosity, but he merely shrugged his shoulders and "carried on." His work in the world of aviation was by no means ended. It might be said that it was yet a long way from attaining its zenith. Early on the morning following the receipt of the baronet’s telegram Sir Reginald’s car pulled up in front of the premises used as the headquarters of the Southern Roads Transport Company. Kenyon and Bramsdean, having given final instructions to their work’s foreman--a former flight-sergeant R.A.F.--jumped into the car, and were soon whisking northwards at a speed that was considerably in excess of that fixed by the regulations. Although of a retiring disposition, Sir Reginald Fosterdyke had made a point of keeping in touch with his former officers. He had a sort of personal interest in every one of them, and on their part they regarded him as one of the best. Whenever, on rare occasions, Fosterdyke ran down to Bournemouth he invariably looked up Bramsdean and Kenyon to talk over old times. But being invited to Air Grange was quite a different matter. Vaguely, the chums wondered what it might mean, conjecturing ideas that somehow failed to be convincing. Yet they knew that there was "something in the wind." They knew Sir Reginald and his methods. Through Blandford, up and past the now deserted hutments where formerly German prisoners led an almost idyllic existence in their enemy’s country, the car sped on until it gained the lofty downs in the direction of Shaftesbury. Then, turning up a steep and narrow lane, the car drew up at the gate of Air Grange. It had to. There was no gate-keeper to unlock and throw open the massive iron gates. That task the chauffeur had to perform, stopping the car again in order to make secure the outer portals of Sir Reginald’s demesne.