We continued on over the moor toward the Brom Water, where was the place that Poacher Davie Elshiner had done his fishing that morning of the loss of poor Harry Foster. I asked Mr. Ablethorpe what we were to do there, and warned him that I had no wish to go nearer to the house of Deep Moat. So that if he counted on visiting his penitent Miss Aphra Orrin he would have to go alone. "I am perturbed in my mind, and that's the truth," he said. "There is something strange along the branch of the river which flows into the Moat. I walked home that way yesterday, and I wish for your presence and assistance. Two can do so much more than one. Also, you know the locality, as well I know. I look to you to help me to solve the mystery which, to my mind at least, hangs over Brom Water." CHAPTER XI THE IRON TRAPDOOR The Hayfork Minister, who had laboured with equal determination to save the crop of a true-blue Presbyterian and to make me a good Churchman, evidently knew his way about the precincts of the Grange. He stepped through a gap in the hedge, jumped a half-dry ditch, and wound his way through the scattering brambles and underbrush as if he had been in his own garden plot. No coward, the Hayfork! It took me all my time to keep up with him, and I am a good jumper, too--nearly as good as Elsie. We went down the side of the Moat Backwater. It is a curious place. It is not, you understand, the Brom Water itself. That comes down from the hills and wimples away across the plain, full of good fish, both trout and salmon, according to their season. But the Moat Backwater connects the pond or little loch which lies in front of the windows of the Grange with the Brom. Whether the connection is absolutely natural, or whether it was originally made by the hand of man, I cannot tell. Neither, so far as I know, can anybody else. But in some places it certainly looks like the latter. At any rate, whenever the Brom is in flood, it "backs up," as it were, into the Backwater, and so runs into the pond. It fills the Moat itself like a tide, and I believe on a few occasions it has even been known to overflow the greensward where the clumps of lilies are, right up to the steps of the front door! There is, of course, always some water in the Lane, which trenches the meadows and runs canalwise through the fringing woods. But at ordinary times the water in the Lane, as much of it as there is, finds its way toward the Brom, owing to the feeding of the Grange Pond by local streamlets. But in times of rain the current runs the other way. Then the Backwater runs brown and turgid into the pond till the lilies tug at their green anchor chains and the Moat itself is lipping full of black, peaty water from the hills.