He meant to abduct the doctor, who himself was dangerous to meddle with, from an Indian village where he apparently was held in great esteem.

The Stonies, living far remote, had escaped the chastening influence of an occasional visit from the patrols of the North-West Police; they knew nothing of law and order.
Moreover, there was a possibility that Clarke might prove too clever for his abductor.
It was certainly a strange adventure for a business man, but Harding believed that his comrade would perish unless help could be obtained.
He shook hands with Benson, who wished him a sincere "Good-luck!" and then, with the Indian leading, struck out through the muskeg toward the shadowy hills..