Baree, Son of Kazan by James Oliver Curwood

For a long time after Pierrot left them the Willow did not move from the spot where she had seated herself beside Baree. It was at last the deepening shadows and a low rumble in the sky that roused her from the fear of the things Pierrot had told her. When she looked up, black clouds were massing slowly over the open space above the spruce tops. Darkness was falling. In the whisper of the wind and the dead stillness of the thickening gloom there was the sullen brewing of storm. Tonight there would be no glorious sunset. There would be no twilight hour in which to follow the trail, no moon, no stars -- and unless Pierrot and the factor were already on their way, they would not start in the face of the pitch blackness that would soon shroud the forest.

Nepeese shivered and rose to her feet. For the first time Baree got up, and he stood close at her side. Above them a flash of lightning cut the clouds like a knife of fire, followed in an instant by a terrific crash of thunder. Baree shrank back as if struck a blow. He would have slunk into the shelter of the brush wall of the wigwam, but there was something about the Willow as he looked at her which gave him confidence. The thunder crashed again. But he retreated no farther. His eyes were fixed on Nepeese.