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Michael D. Beil
When Sophie finds a secret message in the antique fountain pen she bought for her father, she and her friends become involved in a treasure hunt devised by the pen's previous owner, whose house is full of puzzles that protect a hidden treasure.
| Edition | 1st ed. |
|---|---|
| Publisher | Alfred A. Knopf |
| Search language | english |
| ISBN_13 | 978-0-375-86495-7 primary |
| ISBN_13 | 978-0-375-86741-5 primary |
| ISBN_13 | 978-0-375-96741-2 primary |
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