Was Adele shielding some one?
Constance knew that some one must be getting rich from the traffic, probably selling hundreds of ounces a week and making thousands of dollars.

Somehow she felt a sort of indignation at the whole thing.

Who was it?
Who was the man higher up?
In the morning as she was working about her little kitchenette an idea came to her.

Why not hire the vacant apartment cross the hall from Adele?
An optician, who was a friend of hers, in the course of a recent conversation had mentioned an invention, a model of which he had made for the inventor.

She would try it.
Since, with Constance, the outlining of a plan was tantamount to the execution, it was not many hours later before she had both the apartment and the model of the invention.
Her wall separated her from the drug store and by careful calculation she determined about where came the little prescription department.
Carefully, so as to arouse no suspicion, she began to bore away at the wall with various tools, until finally she had a small, almost imperceptible opening.