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Det Hemmelige detektivbureau står over for deres største gennembrud. Finder de endelig Rudolf den Skrækkeliges gemte skat? Og mere vigtigt: Hvad består skatten af? Er det guld og diamanter? Eller måske noget helt andet, der venter på det hemmelige sted, hvor Frida og Karl er begyndt at lede efter den helt store hemmelighed?
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