On hands and knees now the four crept along at the foot of the cliff till Jim stopped them. They turned to the left abruptly, and as Steve felt the ground his fingers detected the hollow track which he had used on former occasions when a prisoner at Quebec. They were on it now, Jim leading still, and Mac in rear, clambering through the darkness.
"H-u-u-u-sh! What in thunder air thet?"
Jim spoke in a whisper, and Steve, who followed closely after him, squeezed up to his side. There was a mass of wood and earth clinging to the face of the cliff, and entirely blocking a portion of the zig-zag Anse du Foulon.
"Get round it," whispered Steve, when he had run his fingers over the obstruction. "Quietly! I think I heard someone moving up above."
Creeping to the right, and making use of every possible stump and rock, Jim clambered round the obstruction, and reached the path again. Another minute and he had gained the summit of the cliff, here some two hundred feet in height, and was stretched on the grass which clad the edge. And there the four lay listening for some few minutes.
"There's a sentry or two 'way over thar," whispered Jim, after a little while. "I can hear the tap of his boots, and what's thet?"
"A song. He is doing what many a sentry does to pass the hours of darkness. Humming a little tune all to himself. It's company to a man posted on such a lonely beat. Well, Jim, we'll go. Keep a bright look-out."
Steve and his father slipped from the edge, past Mac and Jim, and groped their way down the steep path. On any other occasion they would have placed their heels against the earth and slid, for the path gave little holding, while its steepness was lessened by the fact that it ran zig-zag across the face of the cliff. But a slide now would bring the sentries to that quarter, and so the two groped their way down till they reached the bottom. Then Mr. Mainwaring unstrapped a blanket which he had carried attached to his back, and he and Steve sat down beneath it, dragging the edges close to the grass. The rasp of a flint on steel followed, and within a few seconds the candle in their dark lantern was alight.
"Close the dark slide now, Steve," whispered Mr. Mainwaring. "I will take charge of the lamp while you watch. Then you can sing out when I am to expose the light. Remember, lad, you are in command of this little party."
He took the lamp and sat down close to the edge of the water, his eye fixed on the dark figure of his son. As for Steve, he stood like a rock, listening intently and watching the river. Ah! A voice broke from the summit of the cliff, the sing-song tones of which he recognised. It was the sentry again.