19 - Anything You Can Do... by Randall Garrett

An alien with sinister intentions crash-lands on Earth, unleashing a decade of terror. As it lurks in the shadows, it preys on unsuspecting victims and siphons materials for a mysterious goal. Humanitys last chance lies with Bart Stanton, a superhuman engineered specifically to confront this deadly threat known as the Nipe. Will he be able to stop the alien menace before its too late?