Even Doctor Joe was not satisfied of his innocence, and, indeed, everything pointed to Indian Jake's guilt.

Doctor Joe believed that the Angus boys were prejudiced in their loyalty to Indian Jake because of the fact that he had done them kindnesses.
Jamie was sure that if they found this cache there would be proof that he and David and Andy were right and everybody else wrong.

Not only did this feature of the adventure appeal to him, but also the fact that he was for the first time in his life trailing in the wilderness and taking part in an undertaking that seemed to him one of vast importance.
Jamie had never slept in a tent.

His only acquaintance with the great wilderness had been confined to the woods surrounding The Jug, and always when in company with David or Andy or his father or Doctor Joe.
Now he was determined to do as well as any of them, and, no matter how tired he became, to stick to the trail until Doctor Joe gave the signal to return to camp.
As they ascended the slope Jamie kept a sharp look-out to right and left.

Now and again Seth Muggs on his right was hidden by a clump of thick spruce trees or would disappear behind a wooded rise, presently to appear again through the trees.
Jamie was happy.