The Famous Five and the Z-Rays
Book 17 of 18 in this category 
Book Details...
First edition: 1987
Publisher: Knight Books
Illustrator: Bob Harvey
Category: Famous Five Sequels
Genre: Mystery/Adventure
Type: Continuation Books
Publisher: Knight Books
Illustrator: Bob Harvey
Category: Famous Five Sequels
Genre: Mystery/Adventure
Type: Continuation Books
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Reprints
Originally published in 1975 by Librairie Hachette as Les Cinq et le Rayon Z
Author: Claude Voilier
Translated by Anthea Bell
ISBN-10: 0340417099
ISBN-13: 978-0340417096
Brief Summary: A holiday in the Lake District should have meant quiet picnics, fresh air and cycling expeditions. But when a newly invented scientific device falls into the wrong hands, with possibly disastrous consequences, the Five are soon involved. First ruthless burglars and then fanatical spies from a mysterious foreign power, determine to obtain the invention, and it is up to the Five to stop them at all costs . . .