Franklin W. Dixon
Book 123 of The Hardy Boys
Language: English
Goodreads Google Books ISBN
Age Range 1 Younger Audience Juvenile Fiction Mysteries & Detective Stories
Publisher: Turtleback
Published: Jun 15, 1993
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.
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.