Nikola Tesla was a 19th-century American inventor, a contemporary and rival of Thomas Edison. He sold the rights of his invention of the modern induction motor to Westinghouse for one million dollars, cash. Yet he died a recluse, claiming a revolutionary discovery: an inexhaustible source of energy, whose power could be transmitted around the world without loss. This is a factionalized account of the author's investigation into Tesla's theories and claims, and the evidence that other people are carrying out his work now in secret.