As a consequence, his defense was an unexpectedly strong one. He and his lawyers brought forward expert witness after witness to testify in his behalf, all of whom insisted that there was, or might have been, abundant justification for the operation performed.

The experts for the prosecution denied this, of course, and between them they managed to bewilder the jury to such an extent that the long trial resulted finally in a disagreement.

To cap the climax, the district attorney had decided to release the prisoners, rather than hold them for a new trial. He did not believe it possible to convict them, and desired to save the county needless expense.

This decision was a great disappointment to Nick and his assistants, as well as to the public generally.

Nevertheless, the agitation had resulted in placing on the statute books a new law, which made it a crime for any surgeon to perform an operation of any kind without the consent of the patient or some relative or responsible friend. Furthermore, any unnecessary operation, or any surgical or other experiment having no bearing on the patient’s ailment, was at last prohibited, under penalty of a heavy fine and imprisonment.

Therefore, if Grantley should return to his old practices, it would be a comparatively easy matter to convict him.

Nick and his assistants made it their business to keep a close but unobtrusive watch over the liberated surgeons. Grantley and his lieutenant, young Doctor Siebold, accompanied by the nurse, Miss Rawlinson, returned to the former’s house immediately after their release. Most of the others scattered, some of them going so far as to change their names.

The detectives kept track of them all, but did not attempt to interfere with them in any way. Nick was willing to give them the benefit of the doubt. If they had learned their lesson they did not need to fear any further action. If, on the other hand, they should attempt to resume their questionable or criminal methods, it would then be time enough to act.

For some weeks nothing had developed to indicate that Grantley was doing anything at all. He seemed to have no patients, and to be seeking none.

At the end of that interval, Nick Carter had been surprised by the visit of Doctor Vanderpool. After the eminent physician’s departure, the detective remained buried in thought for half an hour or more.