The Hunted Woman by James Oliver Curwood — Read

They rode on into the Valley of Gold. Again MacDonald took the lead, and he rode straight into the face of the black mountain. Aldous no longer made an effort to keep Joanne in ignorance of what might be ahead of them. He put a sixth cartridge into the chamber of his rifle, and carried the weapon across the pommel of his saddle. He explained to her now why they were riding behind -- that if their enemies were laying in wait for them, MacDonald, alone, could make a swift retreat. Joanne asked no questions. Her lips were set tight. She was pale.

At the end of three quarters of an hour it seemed to them that MacDonald was riding directly into the face of a wall of rock. Then he swung sharply to the left, and disappeared. When they came to the point where he had turned they found that he had entered a concealed break in the mountain -- a chasm with walls that rose almost perpendicular for a thousand feet above their heads. A dark and solemn gloom pervaded this chasm, and Aldous drew nearer to MacDonald, his rifle held in readiness, and his bridle-rein fastened to his saddle-horn. The chasm was short. Sunlight burst upon them suddenly, and a few minutes later MacDonald waited for them again.