The fourth volume in the adventures of Tom Derringer, bold young adventurer of the 1880s.
Professor Aloysius Vanderhart has been kidnapped, and his daughter has asked Tom Derringer to find him and bring him home. Other scientists and adventurers have also gone missing. Who took them, and why?
The search for those answers plunges Tom into new adventures -- and into the heart of a mad millionaire's electrical empire!
