She struck a match. By the flickering light they made out a certain number of misshapen letters, obviously written in a hurry and forming two words:

“Asphyxiated. . . . Oxide. . . .”

The match went out. They rose in silence. Asphyxiated! They understood. That was how their parents had perished and how they themselves would perish. But they did not yet fully realize how the thing would happen. The lack of air would never be great enough to suffocate them in this large room, which contained enough to last them for many days.

“Unless,” muttered Patrice, “unless the quality of the air can be impaired and therefore . . .”

He stopped. Then he went on:

“Yes, that’s it. I remember.”

He told Coralie what he suspected, or rather what conformed so well with the reality as to leave no room for doubt. He had seen in old Siméon’s cupboard not only the rope-ladder which the madman had brought with him, but also a coil of lead pipes. And now Siméon’s behavior from the moment when they were locked in, his movements to and fro around the lodge, the care with which he had stopped up every crevice, his labors along the wall and on the roof: all this was explained in the most definite fashion. Old Siméon had simply fitted to a gas-meter, probably in the kitchen, the pipe which he had next laid along the wall and on the roof. This therefore was the way in which they were about to die, as their parents had died before them, stifled by ordinary gas.

Panic-stricken, they began to run aimlessly about the room, holding hands, while their disordered brains, bereft of thought or will, seemed like tiny things shaken by the fiercest gale. Coralie uttered incoherent words. Patrice, while imploring her to keep calm, was himself carried away by the storm and powerless to resist the terrible agony of the darkness wherein death lay waiting. At such times a man tries to flee, to escape the icy breath that is already chilling his marrow. He must flee, but where? Which way? The walls are insurmountable and the darkness is even harder than the walls.

They stopped, exhausted. A low hiss was heard somewhere in the room, the faint hiss that issues from a badly-closed gas-jet. They listened and perceived that it came from above. The torture was beginning.

“It will last half an hour, or an hour at most,” Patrice whispered.