The Seven and Father Christmas
Book 8 of 9 in this category 
Book Details...
First edition: 1986
Publisher: Knight Books
Illustrator: Maureen Bradley
Category: Secret Seven Sequels
Genre: Mystery/Adventure
Type: Continuation Books
Publisher: Knight Books
Illustrator: Maureen Bradley
Category: Secret Seven Sequels
Genre: Mystery/Adventure
Type: Continuation Books
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Originally published in 1981 by Librairie Hachette as Les Sept ne croient pas au Père Noël
Author: Evelyne Lallemand
Translated by Anthea Bell
ISBN-10: 0340399759
ISBN-13: 978-0340399750
Brief Summary: There were two fifty pence pieces in the money Colin's mother gave him for her Christmas shopping——but the strange thing was they didn't weigh the same. This discovery sets the Secret Seven on the trail of a sinister forgery racket. Surely all the Father Christmasses in town can't be involved? The Seven waste no time in trying to trace the source, but will tracks in the snow lead them to the unknown forgers in time, or will the forgers find them first?