"The Magnificent Possession" by Isaac Asimov is a science fiction short story first published in 1940. Walter Sills, a struggling New York chemist, believes he's discovered a revolutionary metal plating process using pure ammonium. His promising invention attracts unwanted attention from gangsters and corrupt politicians eager to exploit his discovery. As complications mount and he pursues a deal with a steel magnate, Sills faces an unexpected problem that threatens everything.