The druggist who sold the poison was found after a canvas of perhaps three or four hundred apothecaries.

The domestic strife in the victim's home was disclosed to the police by relatives of the husband, whose interests naturally conflicted with those of the wife.

Other evidence was furnished reluctantly by the servants, and, through the collective efforts of all the detectives, the woman's crime has been reconstructed in a way calculated to convince the ordinary juror.
It was because Detective-Lieutenant Britz was endowed with a rare combination of talents that enabled him to direct the work of others, even while participating actively in the physical search for evidence, that he ranked as the foremost detective of the Central Office.

Had he been merely a shrewd, capable, resourceful investigator, he could never have attained to his present eminence.
Britz occupied a position subordinate to Manning, but his reputation far exceeded that of the latter.

And Manning, conscious of the value of his lieutenant, reserved his services for the more baffling mysteries which the Central Office from time to time was called upon to solve.
He was not jealous of Britz's reputation, for he was aware that the lieutenant did not aspire to the head of the bureau, would not have accepted the promotion had it been offered.