A planet that contains an abandoned, forgotten resort with a feudal theme-the inhabitants are a computer controller and robots that contain human brain engrams of convicted criminals.
The story concern's the attempt of normal human pioneers to settle in the area and the computer using the robots to destroy them because it believes that the resort, abandoned for centuries must be maintained for when the guests return.
One of the robots "the hunter" rebels against the computer to save the life of a female captive and to assist the humans to win the fight. He does this by throwing an animated toy ball into the cage housing the computer thus causing his engram-ed robot dogs to jump into the cage and thus destroy the electronics.