The year is 1890. English inventor James Swift and his friend Charles Newton face new challenges and adventures. The newest invention by Swift is the fastest submarine ever built. In fact, this latest invention is poised to change ocean transport as dramatically as the Swift Aurora class airship changed air travel. Of course, there are few glitches to work out... It is unstable, overheats, and dives uncontrollably. These are the least of James' problems.

A mysterious masked man and his henchmen seem determined to kill James. There are others who want him dead as well. Foreign governments are scheming to steal his boat for use as a weapon. Spies, industrial and political, are everywhere. The Admiralty is angry because James refuses to turn over the boat's plans to them.

Further, he must locate a sunken American naval vessel containing vital British military secrets before enemies of the Crown find it. All this while building factories, workshops, and employee housing for the production of his Aurora airships before winter.

What about the passionate romance between his best friend, Charles Newton and his headstrong sister Sandra? And will Lady Swift ever solve the problem of her exploding batteries? James Swift and his Underwater Jet Boat is a sensational romp through 19th century science and society, an imaginative action-packed sequel to the first book in the series, James Swift and his Airship Laboratory. This Steampunk book, like its predecessor, uses correct period technology and is lavishly illustrated. It represents the new form of Steampunk, Realtechnologik. The James Swift series of books are the first which allow the reader to print out the book's lavish illustrations and to use a 3-D printer to print out the Steampunk illustrated inventions. This book may not be suitable for younger readers due to violence and adult themes.