description: The Hardy's invention, Roger the Lobber, an automatic tennis ball retrieval and return unit, has been stolen from the Teen Inventor's Club competition and then reappears without warning, transformed into a device of danger.
language: English
title: The Robot's Revenge
titlecomplete: The Robot's Revenge (Hardy Boys, #123)
genres: Fiction, Childrens, Young Adult, Thriller, Adventure, Classics, Mystery
ratings_count: 87
series: The Hardy Boys
publisher: Turtleback Books