The Flaming Forest by James Oliver Curwood

In the few minutes following the efficient and unexpected warning of Bateese an entirely new element of interest entered into the situation for David Carrigan. He had more than once assured himself that he had made a success of his profession of man-hunting not because he was brighter than the other fellow, but largely because he possessed a sense of humor and no vanities to prick. He was in the game because he loved the adventure of it. He was loyal to his duty, but he was not a worshipper of the law, nor did he covet the small monthly stipend of dollars and cents that came of his allegiance to it. As a member of the Scarlet Police, and especially of "N" Division, he felt the pulse and thrill of life as he loved to live it. And the greatest of all thrills came when he was after a man as clever as himself, or cleverer.

This time it was a woman -- or a girl! He had not yet made up his mind which she was. Her voice, low and musical, her poise, and the tranquil and unexcitable loveliness of her face had made him, at first, register her as a woman. Yet as he looked at the slim girlishness of her figure in the bow of the canoe, accentuated by the soft sheen of her partly unbraided hair, he wondered if she were eighteen or thirty. It would take the clear light of day to tell him. But whether a girl or a woman, she had handled him so cleverly that the unpleasantness of his earlier experience began to give way slowly to an admiration for her capability.