{"schema_version":"bf_book_companion_v1","release_id":"20260417T143742Z-pairingsrefresh","book":{"amazon_purchase_url":"https://www.amazon.com/dp/1639731032?tag=bookfrontier-20","asin":"1639731032","authors":["Sarah J. Maas"],"book_id":"9781639731039","canonical_url":"https://bookfrontier.com/books/empire-of-storms-1639731032","cover_image_url":"https://img.bookfrontier.com/9781639731039.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","description":"Only the greatest sacrifice can turn the tide of war. War is brewing in the fifth book in this complete, #1 bestselling Throne of Glass series by Sarah J. Maas, author of the Court of Thorns and Roses (ACOTAR) series. The long path to the throne has only just begun for Aelin Galathynius as war looms on the horizon. Loyalties have been broken and bought, friends have been lost and gained, and those who possess magic find themselves increasingly at odds with those who don't. With her heart sworn to the warrior-prince by her side and her fealty pledged to the people she is determined to save, Aelin will delve into the depths of her power to protect those she loves. But as monsters emerge from the horrors of the past, dark forces stand poised to claim her world. The only chance for salvation lies in a desperate quest that may take more from Aelin than she has to give, a quest that forces her to choose what-and who-she's willing to sacrifice for the sake of peace. Kingdoms collide in this fifth book in the #1 bestselling Throne of Glass series. Other books in this series include: Throne of Glass Crown of Midnight Heir of Fire Queen of Shadows Tower of Dawn Kingdom of Ash The Assassin's Blade (prequel novellas)","forthcoming":false,"isbn13":"9781639731039","publication_date":"20230214","publisher":"Bloomsbury","slug":"empire-of-storms","subtitle":"","title":"Empire of Storms"},"discovery":{"categories":{"all":[{"bisac_code":"FIC009090","confidence_band":"medium","label":"Fantasy Romance","score":0.8189,"source":"bisac_hint_model"},{"bisac_code":"YAF019030","confidence_band":"medium","label":"Epic YA Fantasy","score":0.8058,"source":"bisac_hint_model"}],"hint":[{"bisac_code":"FIC009090","confidence_band":"medium","label":"Fantasy Romance","score":0.8189,"source":"bisac_hint_model"},{"bisac_code":"YAF019030","confidence_band":"medium","label":"Epic YA Fantasy","score":0.8058,"source":"bisac_hint_model"}],"publisher":[{"bisac_code":"FIC009050","confidence_band":"high","label":"Paranormal Fantasy","score":1,"source":"onix_publisher_code"},{"bisac_code":"FIC009090","confidence_band":"high","label":"Fantasy Romance","score":1,"source":"onix_publisher_code"}]},"genres":[{"label":"Fantasy Romance","score":0.8189,"slug":"fantasy-romance"},{"label":"Epic YA Fantasy","score":0.8058,"slug":"epic-ya-fantasy"}],"reader_fit":["Good for fans of epic fantasy with complex world-building","Readers who enjoy romantic subplots intertwined with high-stakes conflict"],"related_lists":[{"intro":"","slug":"shelf-fic009090-fantasy-romance","title":"Fantasy Romance Books (fiction)","url":"https://bookfrontier.com/lists/shelf-fic009090-fantasy-romance"},{"intro":"","slug":"shelf-yaf019030-fantasy-epic","title":"Fantasy Epic Books (young Adult)","url":"https://bookfrontier.com/lists/shelf-yaf019030-fantasy-epic"}],"series":null,"similar_books":[{"authors":["Sarah J. Maas"],"book_id":"9781639731077","cover_image_url":"https://img.bookfrontier.com/9781639731077.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":26.9116,"title":"Kingdom of Ash","url":"https://bookfrontier.com/books/9781639731077"},{"authors":["Sarah J. Maas"],"book_id":"9781639731053","cover_image_url":"https://img.bookfrontier.com/9781639731053.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":24.4827,"title":"Tower of Dawn","url":"https://bookfrontier.com/books/9781639731053"},{"authors":["Sarah J. Maas"],"book_id":"9781639730995","cover_image_url":"https://img.bookfrontier.com/9781639730995.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":22.0466,"title":"Heir of Fire","url":"https://bookfrontier.com/books/9781639730995"},{"authors":["Sarah J. Maas"],"book_id":"9781639731015","cover_image_url":"https://img.bookfrontier.com/9781639731015.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":21.3046,"title":"Queen of Shadows","url":"https://bookfrontier.com/books/9781639731015"},{"authors":["Sarah J. Maas"],"book_id":"9781639730957","cover_image_url":"https://img.bookfrontier.com/9781639730957.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":21.2852,"title":"Throne of Glass","url":"https://bookfrontier.com/books/9781639730957"},{"authors":["Sarah J. Maas"],"book_id":"9781635575583","cover_image_url":"https://img.bookfrontier.com/9781635575583.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":21.1925,"title":"A Court of Mist and Fury","url":"https://bookfrontier.com/books/9781635575583"},{"authors":["Sarah J. Maas"],"book_id":"9781639731091","cover_image_url":"https://img.bookfrontier.com/9781639731091.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":21.1784,"title":"The Assassin's Blade","url":"https://bookfrontier.com/books/9781639731091"},{"authors":["Sarah J. Maas"],"book_id":"9781635577990","cover_image_url":"https://img.bookfrontier.com/9781635577990.jpg?v=20260417T143742Z-pairingsrefresh%3A2026-04-17T14%3A37%3A42Z","score":21.1553,"title":"A Court of Silver Flames","url":"https://bookfrontier.com/books/9781635577990"}],"topics":[{"evidence_refs":["keyword:court thorns roses frost fury starlight mist series"],"label":"Series","score":0.1699,"slug":"series"},{"evidence_refs":["keyword:spicy adult"],"label":"Spicy","score":0.0786,"slug":"spicy"},{"evidence_refs":["keyword:crescent city"],"label":"City","score":0.0722,"slug":"city"},{"evidence_refs":["keyword:house earth blood sky breath flames shadow"],"label":"Earth","score":0.0594,"slug":"earth"},{"evidence_refs":["keyword:romantasy"],"label":"Romantasy","score":0.0552,"slug":"romantasy"}],"what_you_get":["Themes: war and sacrifice, magic vs non-magic conflict, loyalty and betrayal.","Pacing: mixed tempo with quieter and high-intensity stretches.","Story elements: desperate quest, chosen one, monsters from the past."]},"llm_signals":{"confidence":0.9,"pacing":"mixed","reader_fit":["Fans of epic fantasy with complex world-building","Readers who enjoy romantic subplots intertwined with high-stakes conflict"],"themes":["war and sacrifice","magic vs non-magic conflict","loyalty and betrayal"],"tropes":["desperate quest","chosen one","monsters from the past"]},"source_presence":{"amazon":true,"book_detail":true,"goodreads":true,"llm_signals":true,"similarity_seed":true},"stats":{"amazon_ratings_count":128825,"goodreads_ratings_count":1289095,"goodreads_reviews_count":104049,"quality_score":1}}