Rumors fly of Napoleon's planned invasion of England, and British naval commander Thomas Kydd is sent to liaise with American inventor, Robert Fulton, who has created "infernal machines" that can wreak mass destruction from a distance. Fulton believes that his inventions, namely the submarine and torpedo, will win the day for the power that possesses them, and Kydd must help him develop the devices. Despite his own scruples, believing that standing...