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Mark； having some experience of using Coinspinner for guidance； thought that the point called for more discussion。 But that too would have its dangers； and he kept quiet； and read agreement in Ben's eyes。 Mark met Ariane's gaze too； and thought he saw the beginning there of a realistic concern。 And in her eyes as well were other things less easy to interpret。
The party entered the tunnel that Doon had chosen。 They were moving in single file as before； and once more Mark found himself next to last； just in front of the silent Mitspieler； and behind Hubert。 Mark had to stoop his back or bend his neck almost continuously to keep his headlamp from scraping on the roof of the passage as he moved。 If this goes on for very long； he thought； I'll have to take the lamp off and carry it in my hand。 Or depend on others' lights while we're in here … this passage was at least a little wider than the last one； though it still lacked room for two to go fortably abreast。
The tunnel curved sharply from left to right and back again； while constantly descending。 But here the slope of the descent never became as steep as it had in the previous tunnel； and the rough floor here was enough to provide secure footing。 It occurred to Mark to look at the ceiling for torch…smoke stains as he scraped his way along beneath it。 Surely not all of the Blue Temple people who had e through this maze to reach the treasure would have used Old World lights； and generations of traffic ought to have left stains along the proper route。 Indeed Mark thought that he could see some blackening； though on the dark rock it was difficult to be sure。
〃Look at that；〃 said Ben's voice； quietly； from a few meters ahead。 The procession did not stop。 A few more steps and Mark saw what Ben had meant。 They were passing what had once been the mouth of an intersecting passage； its opening now pletely blocked by a cave…in； filled with jumbled slabs and fragments fallen from overhead。 From this mass； down near the floor； there protruded a pair of dead skeletal hands。 Mark found himself taking note that they were of no more than normal human size。 Somehow the mute warning seemed all the more impressive because it had no look of having been planned as a deterrent to intruders。
Mark saw Ariane look down at the bones as she walked past。 The girl showed no sign of shock or fright。 What kind of a growing…up must she have had？ Mark wondered to himself。 Could it have been as strange as my own； or even stranger？ Maybe her powers； if she truly has any； knew me as her brother in that much at least。
There were no more branching passages。 Having no real choice now of which way to go； Doon was not consulting Wayfinder。 Now they had reached a paratively straight stretch of the tunnel； where Mark could see Doon's light bobbing at the head of the procession； revealing the tunnel walls
Which now ended； not far ahead； in a simple circle of darkness。 It was as if the passage here debouched into some vast cave。 As they grew closer with their lights； vague distant forms as of jagged rock appeared in the opening。
〃What's this； by all the demons？〃
The tunnel widened somewhat at its mouth； and the intruders crowded together there as best they could to see what kind of a place they had reached。 There was indeed a large cave in front of them now； and it looked virtually impassable。 The floor of it； if it could be called a floor； was at some distance below the one on which they stood； and it bristled with spiny projections of rock； that gleamed here and there with flecks of brightness but were also heavily stained and coated with what looked in the lamps' beams like some kind of fungus。
And again； behind a sharp outcropping； Mark saw the startling white of human bone。 Some kind of bones； at least； these were jumbled and broken； and Mark could not be sure that they were human。
This deadly looking chamber was some twenty or thirty meters deep； and without any other visible entrance or exit。 On right and left it extended for only a few meters before its side walls closed in to e close to the wall from which the tunnel emerged； on each side the space between was far too small to admit a hope that people might be able to squeeze themselves through it。 Mark； looking upward as best he could out of the tunnel's mouth； could see only the smooth slight bulge of the rounded wall from which the tunnel emerged； and above that； a jagged rocky roof some meters out of reach。 Looking down； the prospect was even more discouraging； upjutting corners of stone waited amid shadows at an intimidating distance below。 In no direction could he see anything that looked like a practical continuation of their path。
At Doon's urging； Ariane now prevailed upon the monkbird to try a short scouting flight into the cave ahead。 The beams of headlamps lit its way； but still it fluttered about uncertainly and had to be encouraged。 At last it flew out for some distance； and was near a far unpromising shelf of rock when there came a sudden popping noise from the fungi near it； and a cloud of dust burst up around the flying creature。 The monkbird came speeding back to Ariane's shoulder； where once more it clung tight in fear。 It brought with it a taste of choking dust； and at the same time an acrid； poisonous odor drifted to the humans' nostrils from the far reaches of the cave。
Doon； muttering demon…oaths between sudden fits of coughing； had his Sword out and was aiming it at various portions of the cave。 But he obtained no response until he pointed it back into the tunnel； in the direction from which the expedition had just e。 He looked so black at this that even Indosuaros thought it wise to make no ment at the moment。
Meanwhile Mark was looking back into the cave； and something he saw there kindled an idea。 He pulled off his headlamp； and； bending down； placed it on the floor； focusing a tight beam of light upon some rocks in the cave that were twenty or thirty meters distant。
〃Turn off all the lights but this one；〃 he told the others。 〃I'm trying to see something。〃
The Baron； on the verge of issuing new orders； hesitated and then did as he had been told。 The other people muttered questions and protests； mingled with their sneezes and coughs。 But in a moment Mark's was the only lamp alight。
He straightened up again。 〃Look。 My lamp isn't moving at all； it's resting on the floor。 Watch the light。〃
From a few bright facets of the distant rock； spots of brilliance were being reflected back into the tunnel； glowing dimly on walls and ceiling and on the faces of the people。
〃Look。〃
The spots of light were all in motion。 It was a slow movement； steady and concerted。 It appeared that the fixed rock； the whole cave out there； was turning past the tunnel's mouth； in a gradual unvarying rotation。 Looking closely at the cave； it was obvious that the perspective of it had changed in the short time the party had been standing in front of it。
People coughed in the fading traces of the poisonspores； and marveled。
〃That can't be right。〃
〃But it is moving。〃
〃I think；〃 said Mark； 〃that I know what's happenin