That must be the explanation for his strange actions.

But still she had heard no shot, and there was a chance that the diagram-- Tremblingly she made her way to the closet and removed the loose board.
A tin box met her eyes, the box in which she had placed the diagram, and she lifted the box out, her fingers shaking as she fumbled at the fastening and raised the lid.
The box was empty.
For a long time she sat there looking at it, anger and resentment fighting within her for the mastery.
Of course, the idol really belonged to Calumet; she would have given it to him in time, but that thought did not lessen her resentment against him.

Somehow, though, she was conscious of a feeling of gratefulness that his visit to the timber clump had no significance beyond the recovery of the idol, and, despite his offense against her privacy, she began after a while to view the matter with greater calm.

And though she did not close her eyes during the remainder of the night, lying on her back in bed and wondering how he had discovered the hiding place of the diagram, she came downstairs shortly after daylight and proceeded calmly about her duties.
She managed, though, to be near the kitchen door when Calumet came down, and, without appearing to do so, she watched his face closely as he prepared himself for breakfast.

But without result.