Book 1
The Man with the Magic Eardrums: The Skull in the Box, Book 1
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Book 2
The Man with the Crimson Box: The Skull in the Box, Book 2
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Book 3
The Man with the Wooden Spectacles: The Skull in the Box, Book 3
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Book 4
The Case of the Lavender Gripsack: The Skull in the Box, Book 4
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