“Near a small village in this country,” I read, “called Gavon, the moon at midnight is said to shine through a certain gap or fissure in a wall of rock close beside the river on to the ruins of a Pict castle, so that the light of its beams falls on to a large flat stone erected there near the gate, and supposed by some to be an ancient and pagan altar. At that moment, so the superstition still lingers in the country side, the evil and malignant spirits which hold sway on Gavon’s Eve, are at the zenith of their powers, and those who invoke their aid at this moment and in this place, will, though with infinite peril to their immortal souls, get all that they desire of them.” The paragraph on the subject ended here, and I shut the book. “Well?” I asked. “Under favourable circumstances two and two make four,” said Hugh. “And four means----” “This. Sandy is certainly in consultation with a woman who is supposed to be a witch, whose path no crofter will cross after nightfall. He wants to learn, at whatever cost, poor devil, what happened to Catrine. Thus I think it more than possible that to-morrow, at midnight, there will be folk by the Picts’ pool. There is another curious thing. I was fishing there yesterday, and just opposite the river gate of the castle, someone has set up a great flat stone, which has been dragged (for I noticed the crushed grass) from the débris at the bottom of the slope.” “You mean that the old hag is going to try to raise the body of Catrine, if she is dead?” “Yes, and I mean to see myself what happens. Come too.” The next day Hugh and I fished down the river from the lodge, taking with us not Sandy, but another gillie, and ate our lunch on the slope of the Picts’ Castle after landing a couple of fish there. Even as Hugh had said, a great flat slab of stone had been dragged on to the platform outside the river gate of the castle, where it rested on certain rude supports, which, now that it was in place, seemed certainly designed to receive it. It was also exactly opposite that lancet window in the basaltic rock across the pool, so that if the moon at midnight did shine through it, the light would fall on the stone. This then was the almost certain scene of the incantations.