So, gentlemen, if you can tell me who those twenty-seven persons are, in three days or a week from this time I will tell you who gave the poison to Mr.Brenton." "You seem very sure of that," said Speed.
"Sure of it?
It is simply child's play.

It is mere waiting.

If, for instance, at the trial Mrs.Brenton is found guilty, and sentenced, the one who is the guilty party is certain to betray himself or herself as soon as he or she is alone.

If it be a man who hopes to marry Mrs.
Brenton, he will be overcome with grief at what has happened.

He will wring his hands and try to think what can be done to prevent the sentence being carried out.