In "Blizzard of the Blue Moon" by Mary Pope Osborne, siblings Jack and Annie return to the magic treehouse for another thrilling adventure. This time, they are transported to the mystical world of Arthurian legend. Their mission takes them to New York City in the late 1930s, where they must locate a mysterious blue moon to help save a captured unicorn. As they navigate the trials posed by ancient myths and modern challenges, Jack and Annie learn about bravery, friendship, and the significance of believing in the magic of the world around them. [Generated by language model - please report any problems].

This book is part of a book series called Magic Tree House .

This book has been graded for interest at 7-10 years.

This book was published in 2009 by Random House Books for Young Readers .

Mary Pope Osborne is the author of over forty books for young people. She was the president of the Author's Guild, the leading organization for professional writers in the US, for two years and has won many awards for her books. She lives in New York with her husband, Will, and their dog, Bailey, who sleeps on top of Mary's desk every day while she writes.