People came and went.

She soon found that he was selling them packets from a box hidden in the woodwork.

That much she had learned, anyhow.
Constance watched faithfully all day with only time enough taken out for dinner.

It was after her return from this brief interval that she felt her heart give a leap of apprehension, as she looked again through the detectascope.

There was Drummond in the back of the store talking to Muller and a woman who looked as if she might be Mrs.Muller, for both, seemed nervous and anxious.
As nearly as she could make out, Drummond was alternately threatening and arguing with Muller.