Description
While attending the Teen Inventors Club competition in Chicago, Frank and Joe Hardy discover that someone is trying to sabotage Roger the Lobber, an automatic tennis ball retrieval and return unit. Original.
Book Details
Format
Paperback
Pages
160 pages
Language
English
Published
Dec 1, 1993
Publisher
Aladdin
Editions
3 editions
ISBN-10
0671793136
ISBN-13
9780671793135
Genres
Young Adult