Heavily revised 1984.
The planet was called Golden in honor of the planeteer whose ship had
crashed there years before. It was an Earth-type world, with humanoid
natives, and other creatures that were – something less.
Or maybe more, for almost all of the planet was covered by an invisible Field which blanked radar, damped the power of the Earthmen's stunners, immobilized their robots and caused watches to run backward, no machine or weapon more complicated than the lever or knife could work inside the Field.
Which meant that the Space Force had to revert to the primitive to explore the world of Golden. and obviously, someone or something hidden in the vast reaches of the planet had planned it that way...
Fred Thomas Saberhagen (1930–2007) was a Chicago-born American science fiction and fantasy fiction author most famous for his Berserker series of science fiction stories.
He also wrote a series of vampire novels in which the vampires (including the famous Dracula) are the protagonists, and a series of post-apocalyptic mytho-magical novels beginning with his popular Empire of the East and continuing through a long series of Swords and Lost Swords novels. Saberhagen died of cancer, in Albuquerque, New Mexico.
Photo: Wikimedia Commons.