Dr. Nikola's Experiment

This fourth novel of Boothbys Dr. Nikola series reveals that Nikola has discovered all of the facts necessary to extend a human beings life. He has studied science and magic secrets of Tibetan monks. He explains:
"It has been a long and tedious search, but such labour only makes success the sweeter. The machinery is now prepared; all that remains is to fit the various parts together. In six months time, if all goes well, I will have a man walking upon this earth who, under certain conditions, shall live a thousand years."
To assist him, he hires a destitute young physician, who explains his predicament:
"As ill luck would have it, however, I had got into the wrong set, and before I had been two years in the hospital was over head and ears in such a quagmire of debt and difficulties that it looked as if nothing but an absolute miracle co-uld serve to extricate me."
That miracle seems to have come to him in the person of Dr. Nikola. The nefarious and wealthy Nikola has purchased a remote castle in the north of England, where the seclusion will allow him and his new assistant and Nikolas deaf-mute malformed Chinese servant to conduct his grand experiment on a human