The Magic Tree House adventures continue in books 9—12. Morganthe magical librarian of Camelot challenges Jack and Annie todiscover the answers to four riddles as they travel under the seato the Wild West, the African plains, and the frozen Arctic. Ifthey succeed, they will become Master Librarians! Books in this setinclude:Dolphins at Daybreak (#9)Ghost Town at Sundown (#10) Lionsat Lunchtime (#11) Polar Bears past Bedtime (#12) Magic Tree HouseBooks #9—12.
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