(From the publisher):
The deep mysteries of Doc Savage are finally revealed! John Sunlight, poetic genius of evil, gruesome master of a thousand elements of screaming terror, discovers the innermost secrets of The Man Of Bronze. Doc Savage finds himself enmeshed in a diabolical web of dark horror as he valiantly battles the appalling machines of destruction he himself has invented!
First published in Doc Savage Magazine # 68 October 1938 - written by Lester Dent.
Original title: Fortress of Solitude
Genre: Fiction→ Adventure→ Male-Action/Adventure