“I don’t fancy I shall be disturbed again,” he said.

“I’ll run over to my place and get you one,” O’Hara insisted. “I shall be back in ten minutes.”

As he went off at a brisk walk Grey turned into the wide passage that gave entrance to the court. The portier was not visible, but at the foot of the narrow stairway to the right a man who in the dim light had the appearance of one of the hotel valets, addressed him.

“Captain Lindenwald has returned, Monsieur Arndt,” he said, quietly, respectfully; “he met with an accident and has come back. He begs that Monsieur Arndt will see him before retiring.”

For a moment Grey stood silent in surprise.

“An accident?” he queried, recovering himself.

“Yes, monsieur. His train ran into an open switch at Villieurs. His leg is broken in two places, and he is injured internally. I will show monsieur to his room.”

As he led the way to the floor above and along a passage towards the back of the house where Herr Schlippenbach’s room had been, Grey marvelled over this new twist in the thread of fate. That the Captain had returned to this hotel and had sent for him argued, he thought, that there must have been some mistake or misunderstanding as to his departure. If he had meant to desert his charge he would not under any circumstances have acted in this fashion. Perhaps—indeed it was quite possible—he had left a letter which some stupid French servant had failed to deliver, or it might simply have been his intention to spend Sunday out of Paris, giving Lutz and Johann permission to take a brief holiday as well. O’Hara had said something about their luggage being gone, but that might have been an error, too.

At a turn in the passage Grey’s guide halted before a door and rapped, playing, as it were, a sort of brief tattoo on the panel with his knuckles; and at the same time a waiter passed on his way to the rear stairway.

An instant later the door was opened by someone who shielded himself behind it. The man who had led the way and done the rapping stepped back, and the American, his eyes a little dazzled by the light, put a foot across the threshold. Just what followed Grey never exactly knew. A myriad brilliant, sparkling, rapidly darting specks of fire filled his vision. In his ears was a thunderous rushing sound like a storm sweeping through a forest—a swollen river churning through rocky narrows. His body seemed dropping through interminable space, gaining momentum with every foot of its fall, but shooting straight, straight downward without a swerve; the lights flashing by him, the winds roaring past him as he sped. An agony of apprehension seized him. He was going to be crushed to atoms; mangled, broken, distorted. He tried to raise his arms, to clutch at the impalpable, but they were held down as if by leaden weights. To bend a knee, to lift a foot, to cry out, were alike impossible of achievement. And then, with a crash that split his ears, that tore every joint asunder, that racked every nerve, muscle, sinew and tendon, the end came. The myriad sparks, like the countless flashing facets of countless diamonds, were drowned in blackest night and the terrifying rush of furious winds and frantic waves was hushed in a silence profound and awful—the blackness and the silence of unconsciousness.