{"schema_version":"bf_book_companion_v1","release_id":"20260417T232332Z","book":{"amazon_purchase_url":"https://www.amazon.com/dp/1524789747?tag=bookfrontier-20","asin":"1524789747","authors":["Deborah Hopkinson","Who HQ","Dede Putra","& 0 more"],"book_id":"9781524789749","canonical_url":"https://bookfrontier.com/books/where-is-the-kremlin-1524789747","cover_image_url":"https://img.bookfrontier.com/9781524789749.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","description":"Get the inside story on the famous fortress in the heart of Moscow that has withstood fires, invaders, and revolutions for almost seven hundred years. Lined by nineteen beautiful towers, the high walls of the Kremlin enclose colorful domed cathedrals, treasure-filled museums, and the Russian capitol. But this Moscow fortress has had its share of dark days. Follow along with author Deborah Hopkinson as she recounts the tales of spying, murder, missing children, and lost treasure that are part of this landmark's long history.","forthcoming":false,"isbn13":"9781524789749","publication_date":"20190521","publisher":"Penguin Young Readers Group","slug":"where-is-the-kremlin","subtitle":"Paperback – Folded Map, May 21, 2019","title":"Where Is the Kremlin?"},"discovery":{"categories":{"all":[{"bisac_code":"JNF025070","confidence_band":"medium","label":"European History for Kids","score":0.7105,"source":"bisac_hint_model"},{"bisac_code":"JNF025140","confidence_band":"medium","label":"Modern History for Kids","score":0.6964,"source":"bisac_hint_model"},{"bisac_code":"HIS010010","confidence_band":"medium","label":"Eastern European History","score":0.6948,"source":"bisac_hint_model"}],"hint":[{"bisac_code":"JNF025070","confidence_band":"medium","label":"European History for Kids","score":0.7105,"source":"bisac_hint_model"},{"bisac_code":"JNF025140","confidence_band":"medium","label":"Modern History for Kids","score":0.6964,"source":"bisac_hint_model"},{"bisac_code":"HIS010010","confidence_band":"medium","label":"Eastern European History","score":0.6948,"source":"bisac_hint_model"}],"publisher":[{"bisac_code":"JNF025070","confidence_band":"high","label":"European History for Kids","score":1,"source":"onix_publisher_code"},{"bisac_code":"JNF025140","confidence_band":"high","label":"Modern History for Kids","score":1,"source":"onix_publisher_code"},{"bisac_code":"JNF043000","confidence_band":"high","label":"Civics & Government","score":1,"source":"onix_publisher_code"}]},"genres":[{"label":"European History for Kids","score":0.7105,"slug":"european-history-for-kids"},{"label":"Modern History for Kids","score":0.6964,"slug":"modern-history-for-kids"},{"label":"Eastern European History","score":0.6948,"slug":"eastern-european-history"}],"reader_fit":["Good for readers who enjoy European History for Kids","Good for readers who enjoy European History for Kids and Modern History for Kids.","Strong fit for readers who prefer grounded, real-world context."],"related_lists":[],"series":null,"similar_books":[{"authors":["Roberta Edwards","Who HQ","Gregory Copeland","& 0 more"],"book_id":"9780593751848","cover_image_url":"https://img.bookfrontier.com/9780593751848.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":17.4459,"title":"What Was the Renaissance?","url":"https://bookfrontier.com/books/9780593751848"},{"authors":["Jim O'Connor","Who HQ","John Mantha","James Bennett"],"book_id":"9780448462868","cover_image_url":"https://img.bookfrontier.com/9780448462868.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":14.8715,"title":"What Was the Battle of Gettysburg?","url":"https://bookfrontier.com/books/9780448462868"},{"authors":["Bonnie Bader","Who HQ","John O'Brien"],"book_id":"9780448479095","cover_image_url":"https://img.bookfrontier.com/9780448479095.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":14.7414,"title":"Who Was Robert E. Lee?","url":"https://bookfrontier.com/books/9780448479095"},{"authors":["Jim O'Connor","Who HQ","Tim Foley"],"book_id":"9781524789770","cover_image_url":"https://img.bookfrontier.com/9781524789770.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":13.7655,"title":"What Was the Vietnam War?","url":"https://bookfrontier.com/books/9781524789770"},{"authors":["Emily Sands","Dugald Steer","Nick Harris","Helen Ward"],"book_id":"9780763626389","cover_image_url":"https://img.bookfrontier.com/9780763626389.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":12.9143,"title":"Egyptology","url":"https://bookfrontier.com/books/9780763626389"}],"topics":[{"evidence_refs":["keyword:history"],"label":"History","score":0.9238,"slug":"history"},{"evidence_refs":["keyword:kids"],"label":"Kids","score":0.2279,"slug":"kids"},{"evidence_refs":["keyword:boys"],"label":"Boys","score":0.2278,"slug":"boys"},{"evidence_refs":["keyword:ages"],"label":"Ages","score":0.0774,"slug":"ages"}],"what_you_get":["Themes: History, Kids, Boys.","Reading lane: European History for Kids and Modern History for Kids.","Publisher: Penguin Young Readers Group."]},"llm_signals":null,"source_presence":{"amazon":true,"book_detail":true,"goodreads":true,"llm_signals":false,"similarity_seed":true},"stats":{"amazon_ratings_count":122,"goodreads_ratings_count":174,"goodreads_reviews_count":22,"quality_score":0.8912}}