The entrance to the cave system – for, as Alec explained to Connor, this was not simply a large Cavern, as it had many tunnels, high enough for even a tall man to walk upright, and other smaller caverns on different levels, indeed some were reached by staircases, steps cut out of the living rock, and worn smooth by generations of Cave Dwellers over many centuries of habitation – was almost invisible: a large area of broom, now yellow with it's summer flowering, actually grew on what was a kind of trap-door, a hinged frame like a tray, containing a fair weight of soil as well as the vegetation itself and not unnaturally, Connor expected it to be heavy to lift but – as Alec demonstrated the cantilever system which his brother had designed and built- with upward pressure exerted with minimum effort on one particular spot, the whole panel swung up and admitted them both, before Alec lowered it again and hid them from sight; he took a couple of torches from wall sconces and lit them, then, handing one to Connor, he led the way deep into the mountain: the first Cavern was large and spacious, a wide level floor, and tiers of seating carved out on two sides, then further in it branched out into a complex of passageways leading in many directions: forward, to right and left, with sloping walkways going up or down, and stepped climbs more steeply, going above their heads, or below their feet: "James measured twenty miles of tunnels, and over a hundred what might be called apartments, these might be family areas, or simply sleeping quarters, they’ve all probably had different functions depending on how many people were resident at any time; he stopped suddenly and pointed at what was to turn out to be the first of many wall-paintings, a life-sized image of a man and woman, standing apposed and seeming to be looking directly at Connor and Alec, but these weren't the sort of things Connor had expected – instead of primitive figures wearing animal skins, this pair looked modern or, truth to tell, beyond modern: they were obviously meet cute and though they were wearing casual dress, Connor had seen nothing like them in Glasgow, even in the films he and Kathleen enjoyed, particularly Hollywood musicals; he moved closer and after a hesitant glance towards Alec, who nodded, he touched the surface and found it smooth and glossy: "what is it?" he asked, and Alec told him: "a photograph; they've coated the wall with a three-colour light sensitive paint, I suppose, and then projected a colour negative, and this is the result: and see below, it's quite small, but if you kneel down you should find it, and Connor did: 'July 7th, 2053, Darren and Natasha Kopernick were here!' and he gasped: "that's more than a hundred years in the future!" and all Alec said was: "exactly!" after a pause, Alec led Connor up a winding carved out staircase to a small chamber: "this is the apotheosis, the highest part of the cave system, this is the place from which Jocelyn and James disappeared; I have been here many times, I have examined the walls and floor with a magnifying glass, but found nothing out of the ordinary – but perhaps I am looking with the eyes of a scientist, and maybe it needs a Jacques Bonhomme, or as we Scots might say, one of Jock Tamson's Bairns to find the clue; cast your eyes around, Connor, and see if there is anything you think significant; which he did, slowly and with great attention to various parts of the rock; it was almost ten minutes before he paused, looked closely at a section which, to Alec, looked no different from the rest, then said: "see, here, duz thon bit no luik like a haun-print?" and spreading his fingers, he laid his own hand on the part of the rock surface that had claimed his attention, just as Alex grasped his shoulder with a cry of: "don't, man, for God's sake!" but just to late to stop him!