"If you please," said Salt, and paid the narrative the compliment of a close and tranquil attention.
"It was rather a peculiar place to come on unexpectedly," continued Miss Lisle. "It had originally been a powder works, and the old notices warning intruders had been left standing; as a matter of fact a stranger would probably still take it to be a powder mill, but one learned locally that it was the depot and distributing centre of an artificial manure company with a valuable secret process. Which, of course, made it less interesting than explosives."
"And less dangerous," suggested Salt, smiling.
"I don't know," shot back Miss Lisle with a glance. "Mark the precautions. There was the stream almost enclosing this place—the size, I suppose, of a considerable farm—and in the powder mill days it had been completely turned into an island by digging a canal or moat at the narrowest point of the bend. Immediately on the other side of the water rose the high brick wall topped with iron spikes. The one bridge was the only way across the stream, the one set of double doors, as high as the wall, the only way through beyond. Inside was thickly wooded. I don't suggest wild animals, you know, but savage dogs would not surprise me.
"As I stood there, concluding that I should have to turn back, I heard a heavy motor coming down the lane. It came on very quickly as though the driver knew the twisting road perfectly, shot across the bridge, the big gates fell open apparently of their own accord, and it passed inside. I had only time to note that it was a large trade vehicle with a square van-like body, before the gates had closed again."
Miss Lisle paused for a moment, but she had by no means reached the end of her pointless adventure.
"I had seen no one but the motor driver, but I was mistaken in thinking that there was no one else to see, for as I stood there undecided a small door in the large gate was opened and a man came out. He was obviously the gate-keeper, and in view of the notices I at once concluded that he was coming to warn me off, so I anticipated him by asking him if he could lend me a spanner. He muttered rather surlily that if I waited there he would see, and went back, closing the little door behind him. I thought that I heard the click of a self-acting lock. Presently he came back just as unamiable as before and insisted on screwing up the bolt himself—to get me away the sooner, I suppose. He absolutely started when I naturally enough offered him sixpence—I imagine the poor man doesn't get very good wages—and went quite red as he took it."
"And all ended happily?" remarked Salt tentatively, as though he had expected that a possible relevance might have been forthcoming after all.
"Happily but perplexingly," replied Miss Lisle, looking him full in the face as she unmasked the point of her long pointless story. "For the surly workman who was embarrassed by sixpence was my gentlemanly neighbour of the Queen's Hall meeting, and I was curious to know how he should be serving the object of the League by acting as a gate-keeper to the Lacon Equalised Superphosphate Company."
Salt laughed quietly and looked back with unmoved composure. "No doubt many possible explanations will occur to you," he said with very plausible candour. "The simplest is the true one. Several undertakings either belong to the League or are closely connected with it, for increasing its revenue or for other purposes. The Lacon is one of these."