For a quarter of a century he had been famous as an exceptionally daring and skillful surgeon. In recent years, however, his great reputation had suffered from a blight, due to his general eccentricities, and, in particular, to his many heartless experiments upon live animals.

At length, he had gone so far as to perform uncalledfor operations on human beings in his ruthless search for knowledge.

Nick Carter had heard rumors of this, and had set a trap for Grantley. He had caught the surgeon and several younger satellites red-handed.

Their victim at that time was a young Jewish girl, whose heart had been cruelly lifted out of the chest cavity, without severing any of the arteries or veins, despite the fact that the girl had sought treatment only for consumption.

Grantley and his accomplices had been placed on trial, charged with manslaughter. The case was a complicated one, and the jury disagreed. The authorities subsequently released the prisoners in the belief that the chances for a conviction were not bright enough to warrant the great expense of a new trial.

Nevertheless, as a result of the agitation, a law was passed, which attached a severe penalty to all such unjustifiable experiments or operations on human beings.

After a few weeks of freedom, Grantley had committed a still more atrocious crime. His victim in this instance had been one of the most prominent financiers in New York, J. Hackley Baldwin, who had been totally blind for years.

For years Grantley had been nursing two grievances against the afflicted millionaire. Under pretense of operating on Baldwin’s eyes—after securing the financier’s complete confidence—he had removed parts of his patient’s brain.

Owing to Grantley’s great skill, the operation had not proved fatal; but Baldwin became a hopeless imbecile.

Nick Carter and his assistants again captured the fugitive, who had fled with his assistant, Doctor Siebold. This pair was locked up, together with a nurse and Grantley’s German manservant, who were also involved.