The Riddle of the Counterfeiter
Book 1 of 1 in this category 
Book Details...
First edition: 1977
Publisher: Bertelsmann Verlag
Cover Art: Nikolaus Plump
Illustrator: Kurt Schmischke
Category: German Barney Sequel
Genre: Mystery/Adventure
Type: Continuation Books
Publisher: Bertelsmann Verlag
Cover Art: Nikolaus Plump
Illustrator: Kurt Schmischke
Category: German Barney Sequel
Genre: Mystery/Adventure
Type: Continuation Books
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This book was published in German, supposedly translated by Brigitte Blobel, but as there has been no English version of it she must have actually written it.