Project Gutenberg 2009-06-06 Public domain in the USA. 216 Hall, Desmond Winter 1909 1992 Raiders Invisible Produced from Astounding Stories November 1931. Produced by Sankar Viswanathan, Greg Weeks, and the Online Distributed Proofreading Team at http://www.pgdp.net "Raiders Invisible" by Desmond Winter Hall is a science fiction novel written during the early 20th century. The story revolves around a thrilling war game scenario between two naval fleets—the Blue Fleet and the Black Fleet—set against the backdrop of the Panama Canal. The plot explores themes of espionage and advanced technology, particularly focusing on an invisible enemy that employs deadly gases and sabotage to thwart American military efforts. The protagonist, Lieutenant Christopher Travers, is a skilled pilot tasked with scouting during the naval exercises. However, the situation escalates when the newly launched dirigible ZX-2 is downed under mysterious circumstances, leading Chris to uncover a plot that threatens not only the war games but also national security. As Chris confronts the invisible saboteur responsible for the attacks, he engages in a desperate battle to prevent further destruction, racing against time to stop an impending disaster at the Gatun Spillway. This tension-filled narrative combines action with a sense of urgency, enveloped in an inventive premise of invisibility and deadly aerial maneuvers. (This is an automatically generated summary.) Reading ease score: 80.5 (6th grade). Easy to read. en Science fiction PS Text Science Fiction Astounding Stories Browsing: Literature Browsing: Science-Fiction & Fantasy Category: Science-Fiction & Fantasy Category: Adventure Category: Novels Category: American Literature 102928 2025-06-12T05:48:06.936221 text/html 99914 2019-06-21T09:36:22 text/html; charset=iso-8859-1 193182 2019-06-21T09:36:48 text/html; charset=iso-8859-1 application/zip 276374 2025-06-12T05:48:12.954216 application/epub+zip 276345 2025-06-12T05:48:10.047269 application/epub+zip 102259 2025-06-12T05:48:08.820229 application/epub+zip 403484 2025-06-12T05:48:15.143201 application/x-mobipocket-ebook 395961 2025-06-12T05:48:12.202226 application/x-mobipocket-ebook 208159 2022-09-13T12:51:13.410735 application/x-mobipocket-ebook 94788 2025-06-12T05:48:06.565219 text/plain; charset=us-ascii 94574 2019-06-21T09:36:22 text/plain; charset=us-ascii 36621 2019-06-21T09:36:48 text/plain; charset=us-ascii application/zip 18549 2025-06-12T05:48:15.288187 application/rdf+xml 15598 2025-06-12T05:48:09.377236 image/jpeg 3806 2025-06-12T05:48:09.101217 image/jpeg 271994 2025-06-12T05:48:06.958231 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog