[1] "Using Dr. Nikola for all he is worth, Guy Boothby brings us in this book to an experiment which is rather thrilling than original.
With the stuff obtained at such fearful risk from the Thibetan monastery he proposes to do for an ancient Spanish Don all that the Devil did for Dr. Faustus.
But it is beyond the doctor, alas, to restore the mind, which has decayed, and his rejuvenated Don is a powerful and malignant idiot.
"[2] Following the book's initial newspaper serialisation, and then publication by Ward, Lock and Bowden in 1898[3] it was subsequently published as follows:[1] The novel was translated into Swedish (1899).
[1] The Australian Star noted that this "is a book which will not disappoint readers who like their Boothby, nor diminish the author's brilliant if peculiar fame.