The Bulletproof Adventures of Damian Stockwell Books in Order

When a friend vanishes in a Central American jungle, adventurer Damian Stockwell follows the clue of a disturbing tribal mask. Accompanied by his valet Bertrand, he confronts a sinister threat in a rescue mission that demands more than brute force.

On the eve of World War II, Nikola Tesla tells Damian Stockwell that plans for his most powerful weapons have been stolen. Stockwell pursues the thieves through Nazis, ninjas and dangerous inventions before those weapons can be turned against America.

An invention of Damian Stockwell's causes havoc at the World's Fair, sending him and his valet Bertrand after those responsible. Their investigation crosses New York, London and France as unseen enemies and murderous robots threaten a much larger disaster.