This was additional cause for suspicion.
I called on a detective and told him that I suspected Brooks.

At this he smiled.

Then I said that if he would agree to give half the reward to any charity that I might name, in the event of success, I would submit my plan, and then he became serious.

I convinced him that I had not only a plausible but a direct clue, and he agreed to my proposal.
I then told him about the doctor; I expressed my belief that the old woman must know something and urged that this might be brought out if we could get her away and place her under the proper treatment.

Well, we learned that she had a sister living in New Jersey.