No!  War could not be.  A catastrophe more vital than war threatened Switzerland—­the world—­wide revelation of a secret which, exposed, would throw all civilisation into righteous fury and the Swiss Republic itself into revolution.

And this sinister, hidden thing which must deter Switzerland from declaring war against the Boche was a part of the Great Secret:  and a man and a woman in the Secret Service of the United States, lying hidden among the forests below the white shoulder of Mount Thusis, were beginning to guess more about that secret than either of them had dared to imagine.

There where they lay together side by side among Alpine roses in full bloom—­there on the crag’s edge, watching the Swiss soldiery below combing the flanks of Mount Terrible for the perpetrators of that hellish murder at the shrine, these two people could see the Via Mala which had been the Via Crucis—­the tragic Golgotha for that poor girl Helsa Kampf.

They could almost see the gaunt, black cross itself from which the brutish Boches had kicked the carved and weather-beaten figure of Christ in order to nail to the massive cross the living hands and feet of that half-senseless girl whom they supposed had betrayed them.

The man lying there on the edge of the chasm was Kay McKay; the girl stretched on her stomach beside him was Evelyn Erith.

All that day they watched the Swiss soldiers searching Mount Terrible; saw a red fox steal from the lower thickets and bolt between the legs of the beaters who swung their rifle-butts at the streak of ruddy fur; saw little mountain birds scatter into flight, so closely and minutely the soldiers searched; saw even a big auerhahn burst into thunderous flight from the ferns to a pine and from the pine out across the terrific depths of space below the white shoulder of Thusis.  At night the Swiss camp-fires glimmered on the rocks of Mount Terrible while, fireless, McKay and Miss Erith lay in their blankets under heaps of dead leaves on the knees of Thusis, cold as the moon that silvered their forest beds.

But it was the last of the soldiery on Mount Terrible; for dawn revealed their dead fire and a summit untenanted save by the stark and phantom crucifix looming through rising mists.

Evelyn Erith still slept; McKay fed the three carrier-pigeons, washed himself at the snow-rill in the woods, then went over to the crag’s gritty edge under which for three days now the ghoulish clamour of a lammergeier had seldom ceased.  And now, as McKay peered down, two stein-adlers came flapping to the shelf on which hung something that seemed to flutter at times like a shred of cloth stirred by the abyss winds.

The lammergeier, huge and horrible with scarlet eyes ablaze, came out on the shelf of rock and yelped at the great rock-eagles; but, if something indeed lay dead there, possibly it was enough for all—­or perhaps the vulture-like bird was too heavily gorged to offer battle.  McKay saw the rock-eagles alight heavily on the shelf, then, squealing defiance, hulk forward, undeterred by the hobgoblin tumult of the lammergeier.