{"schema_version":"bf_book_companion_v1","release_id":"20261010T034321Z-reviewed-full-unique-works","book":{"amazon_purchase_url":"https://www.amazon.com/dp/1101936398?tag=bookfrontie00-20","asin":"1101936398","authors":["Mary Pope Osborne","Natalie Pope Boyce"],"book_id":"9781101936399","canonical_url":"https://bookfrontier.com/books/world-war-ii-9781101936399","cover_image_url":"https://img.bookfrontier.com/9781101936399.jpg?v=27daa07b28668296","description":"In the next Magic Tree House® Fact Tracker, track the facts about World War II—with Jack and Annie! When Jack and Annie came back from their adventure in Magic Tree House Super Edition #1: World at War, 1944, they had lots of questions. How did World War II begin? Why were so many innocent people killed? What was D-Day? Find out the answers to these questions and more as Jack and Annie learn all about one of the darkest hours of history. 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