#123 The Robot's Revenge
Danger is unleashed -- and the Hardys are targeted for attack!
Frank and Joe face a new and unknown nemesis -- a master of crime by remote control!
Chicago is the site of the Teen Inventors Club competition -- the winner to receive a college scholarship and a lucrative manufacturing contract. The Hardys and their friend Phil Cohen have high hopes for Roger the Lobber, an automatic tennis ball retrieval and return unit. But someone is playing a more serious game ... a game called sabotage!
Numerous inventions have been stolen, including Roger the Lobber. But the strangest of all, they reappear without warning in modified form -- the teen creations transformed into devices of danger. In their search for the high-tech saboteur, Frank and Joe will have to watch every step. For there's no telling what the next invention in terror will be!
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