And the janitor, as if he understood her question, turned round reassuringly. "Only our refrigerating machines, madame. We think them wonderfully quiet, considering. They whirr on night and day, they are never stilled. As for me—" he added jovially—"I would miss the noise very much. But as I lie in bed listening to the sound I know that all is well. It would be a very serious thing indeed for us if the machines stopped, even for ten minutes—" he shook his head mysteriously.

Nancy breathed a little more easily. She had not understood what it was exactly that he had said, but his voice had sounded cheerful and kind: and she remained for a while ignorant of the meaning and object of the machines by which they passed quickly in a great room filled with moving wheels, and, even on this hot June day, full of icy breaths.

As they came to the end of the engine-room their guide turned round and gave the young American a quick, warning look. "C'est ici," he said, under his breath. And Gerald stepped quickly in front of Mrs. Dampier.

"Is what we are going to see very horrible?" he whispered hurriedly. "I wish this lady to be spared as far as may be from seeing anything especially painful."

"As to horrible—well, it depends, monsieur, on what is thought horrible! A good many of my pensioners have been dangerous customers in their time—but now? Fortunately, monsieur, the dead cannot bite!" and he smiled at his own grim joke.

Gerald Burton shuddered involuntarily, but as he and Nancy followed the man from the engine-room he gave a sigh of relief, for they had emerged into a wide, airy shed.

The place looked like a workshop of sorts, for it was lined, on one side, with what looked like gigantic chests of drawers, painted black; while standing about on the stone pavement were long white deal packing cases. Over in a corner was a black box, of which the lid was loose.

"You said Number 4, monsieur?" said the man in a business-like tone. "Well, I will get you out Number 4. Kindly stand just over there—not in the sunlight, that might prevent your seeing clearly." He added, speaking far more gently and kindly than he had yet done, "Madame must not be frightened. It will be all over in a moment."

Gerald looked down at his companion. Her face seemed to have become quite small, like that of a child, but the pupils of her eyes had dilated: as she stared up at him fearfully he likened them, in his heart, to deep unfathomable pools.

She came close up to him, and then, without stopping to think, simply following a natural instinct, he put his arm round her shoulder; so would he have done to his sister in a moment of similar distress.