The Flaming Forest by James Oliver Curwood

With the slow approach of the storm which was advancing over the wilderness, Carrigan felt more poignantly the growing unrest that was in him. He heard the last of St. Pierre's voice, and after that the fires on the distant shore died out slowly, giving way to utter blackness. Faintly there came to him the far-away rumbling of thunder. The air grew heavy and thick, and there was no sound of night-bird over the breast of the river, and out of the thick cedar and spruce and balsam there came no cry or whisper of the nocturnal life waiting in silence for the storm to break. In that stillness David put out the lights in the cabin and sat close to the window in darkness.

He was more than sleepless. Every nerve in his body demanded action, and his brain was fired by strange thoughts until their vividness seemed to bring him face to face with a reality that set his blood stirring with an irresistible thrill. He believed he had made a discovery, that St. Pierre had betrayed himself. What he had visioned, the conclusion he had arrived at, seemed inconceivable, yet what his own eyes had seen and his ears had heard pointed to the truth of it all. The least he could say was that St. Pierre's love for Marie-Anne Boulain was a strange sort of love. His attitude toward her seemed more like that of a man in the presence of a child of whom he was fond in a fatherly sort of way. His affection, as he had expressed it, was parental and careless. Not for an instant had there been in it a betrayal of the lover, no suggestion of the husband who cared deeply or who might be made jealous by another man.