Zack Parsons presents a detailed examination of 20 real inventions from World War II that never saw the light of day. Each entry includes full technical details, a complete history, in-depth analysis, one or more illustrations and an acerbic fictionalised account of the invention's success or failure.

Panzerkampfwagen VIII Maus --Landkreuzer P. 1000 Ratte -- V-3 Hochdruckpumpe -- Panzerabwehrrakete X-7 Rotk4ippchen -- Nachtsichtgeraten-German Night-Vision Devices -- Landkreuzer P. 1500 Monster -- Weser WP 1003/1 -- M1932 Christie "Flying Tank" -- The heliofly I/57 -- The German Space Program -- Horten Ho IXB Nachtjiger -- The German Atomic Bomb -- Daimler-Benz Carrier & Parasite Project Series -- Sanger Silbervogel Antipodal Bomber -- VS8 Tragfligelboot -- Type XI-B U-cruiser -- HMS Habbakuk -- Project Loedinge: Seeteufel -- Submarine-Launched Rockets.