Magic Tree House Boxed Set, Books 9-12: Dolphins at Daybreak, Ghost Town at Sundown, Lions at Lunchtime, and Polar Bears Past Bedtime

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

• Magic Tree House Boxed Set, Books 13-16: Vacation Under the Volcano, Day of the Dragon King, Viking Ships at Sunrise, and Hour of the Olympics
• Magic Tree House Boxed Set, Books 5-8: Night of the Ninjas, Afternoon on the Amazon, Sunset of the Sabertooth, and Midnight on the Moon
• Magic Tree House Volumes 17-20 Boxed Set: The Mystery of the Enchanted Dog (Magic Tree House (R))
• Midnight on the Moon (Magic Tree House, No. 8)
• Sunset of the Sabertooth (Magic Tree House, No. 7)
• Magic Tree House Boxed Set, Books 1-4: Dinosaurs Before Dark, The Knight at Dawn, Mummies in the Morning, and Pirates Past Noon
• Magic Tree House Volumes 21-24 Boxed Set: American History Quartet (Magic Tree House (R))
• Magic Tree House Volumes 25-28 Boxed Set (Magic Tree House (R))
• Afternoon on the Amazon (Magic Tree House, No. 6)
• Mummies in the Morning (Magic Tree House, No. 3)