German language
Published 1965 by Bertelsmann Jugendbuchverlag.
Enid Blyton: Geheimpolizei Schwarze Sieben (German language, 1965, Bertelsmann Jugendbuchverlag)
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A priceless pearl necklace has been stolen, and the Secret Seven witnessed the thief making his escape. But where has he hidden the necklace?
