Eleven-year-old twins Oliver and Celia Navel live on the 4-1/2th floor of the Explorers Club with their father, Dr. Navel. Their mother, Dr. Navel, has been missing for years. So when an explorer shows up with a clue as to where his wife could be, Dr. Navel drags Oliver and Celia to Tibet to find her. Illustrations.
- eBooks : Kobo
- Minimum Age : 10
- Publisher : Philomel Books
- Book Format : Hardcover
- Number of Pages : 0355
- Series Part : 01
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