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The mystery of the hidden gold
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The mystery of the invisible hand
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The mystery of the invisible spy
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The mystery of the invisible thief
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The mystery of the jewelled moth
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The mystery of the king's ransom
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The mystery of the lost Cézanne
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The mystery of the midnight ghost
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The mystery of the missing masterpiece
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The mystery of the secret room
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The mystery of the skeleton key
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The mystery of the spiteful letters
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The mystery of the strange piper
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The mystery of the vanishing skeleton
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The mystery of the whistling caves
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The mystery of three quarters
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