{"schema_version":"bf_book_companion_v1","release_id":"20260414T102527Z","book":{"amazon_purchase_url":"https://www.amazon.com/dp/0140159959?tag=bookfrontier-20","asin":"0140159959","authors":["Ray Monk"],"book_id":"9780140159950","canonical_url":"https://bookfrontier.com/books/9780140159950","cover_image_url":"https://img.bookfrontier.com/9780140159950.jpg?v=20260414T102527Z%3A2026-04-14T10%3A25%3A27Z","description":"\"Great philosophical biographies can be counted on one hand. Monk's life of Wittgenstein is such a one.\"— The Christian Science Monitor.","forthcoming":false,"isbn13":"9780140159950","publication_date":"19911101","publisher":"Penguin Publishing Group","slug":"ludwig-wittgenstein","subtitle":"The Duty of Genius","title":"Ludwig Wittgenstein"},"discovery":{"categories":{"all":[{"bisac_code":"REL007010","confidence_band":"low","label":"Buddhist History","score":0.6559,"source":"bisac_hint_model"},{"bisac_code":"LIT004170","confidence_band":"low","label":"German Literary Criticism","score":0.6485,"source":"bisac_hint_model"},{"bisac_code":"LIT025040","confidence_band":"low","label":"Religion in Literature","score":0.6446,"source":"bisac_hint_model"}],"hint":[{"bisac_code":"REL007010","confidence_band":"low","label":"Buddhist History","score":0.6559,"source":"bisac_hint_model"},{"bisac_code":"LIT004170","confidence_band":"low","label":"German Literary Criticism","score":0.6485,"source":"bisac_hint_model"},{"bisac_code":"LIT025040","confidence_band":"low","label":"Religion in Literature","score":0.6446,"source":"bisac_hint_model"}],"publisher":[{"bisac_code":"BIO009000","confidence_band":"high","label":"Philosophers' Lives","score":1,"source":"onix_publisher_code"},{"bisac_code":"HIS037070","confidence_band":"high","label":"20th-Century History","score":1,"source":"onix_publisher_code"},{"bisac_code":"PHI011000","confidence_band":"high","label":"Logic","score":1,"source":"onix_publisher_code"}]},"genres":[{"label":"Buddhist History","score":0.6559,"slug":"buddhist-history"},{"label":"German Literary Criticism","score":0.6485,"slug":"german-literary-criticism"},{"label":"Religion in Literature","score":0.6446,"slug":"religion-in-literature"}],"reader_fit":["Good for readers who enjoy Buddhist History","Good for readers interested in philosophy","Good for fans of Philosophy"],"related_lists":[],"series":null,"similar_books":[{"authors":["Sarah Bakewell","Antonia Beamish","Audible Studios"],"book_id":"9781590518892","cover_image_url":"https://img.bookfrontier.com/9781590518892.jpg?v=20260414T102527Z%3A2026-04-14T10%3A25%3A27Z","score":14.2496,"title":"At the Existentialist Café","url":"https://bookfrontier.com/books/9781590518892"},{"authors":["G.K. Chesterton"],"book_id":"9781649741332","cover_image_url":"https://img.bookfrontier.com/9781649741332.jpg?v=20260414T102527Z%3A2026-04-14T10%3A25%3A27Z","score":12.5974,"title":"St Francis of Assisi","url":"https://bookfrontier.com/books/9781649741332"},{"authors":["Stephen Greenblatt"],"book_id":"9780393882278","cover_image_url":"https://img.bookfrontier.com/9780393882278.jpg?v=20260414T102527Z%3A2026-04-14T10%3A25%3A27Z","score":12.1455,"title":"Dark Renaissance","url":"https://bookfrontier.com/books/9780393882278"},{"authors":["Adrian Tinniswood"],"book_id":"9781594483097","cover_image_url":"https://img.bookfrontier.com/9781594483097.jpg?v=20260414T102527Z%3A2026-04-14T10%3A25%3A27Z","score":10.6411,"title":"The Verneys","url":"https://bookfrontier.com/books/9781594483097"},{"authors":["Fintan O'Toole"],"book_id":"9781324092872","cover_image_url":"https://img.bookfrontier.com/9781324092872.jpg?v=20260414T102527Z%3A2026-04-14T10%3A25%3A27Z","score":10.5764,"title":"We Don't Know Ourselves","url":"https://bookfrontier.com/books/9781324092872"},{"authors":["Ernesto Che Guevara","Walter Salles","Cintio Vitier","Aleida Guevara"],"book_id":"9781644210680","cover_image_url":"https://img.bookfrontier.com/9781644210680.jpg?v=20260414T102527Z%3A2026-04-14T10%3A25%3A27Z","score":10.5082,"title":"The Motorcycle Diaries","url":"https://bookfrontier.com/books/9781644210680"}],"topics":[{"evidence_refs":["keyword:history"],"label":"History","score":0.9238,"slug":"history"},{"evidence_refs":["keyword:world history"],"label":"World","score":0.2022,"slug":"world"},{"evidence_refs":["keyword:philosophy books"],"label":"Philosophy","score":0.1142,"slug":"philosophy"},{"evidence_refs":["keyword:biography"],"label":"Biography","score":0.088,"slug":"biography"},{"evidence_refs":["keyword:biographies"],"label":"Biographies","score":0.0718,"slug":"biographies"}],"what_you_get":["Themes: History, Philosophy, Biography.","Reading lane: Buddhist History and German Literary Criticism.","Publisher: Penguin Publishing Group."]},"llm_signals":null,"source_presence":{"amazon":true,"book_detail":true,"goodreads":true,"llm_signals":false,"similarity_seed":true},"stats":{"amazon_ratings_count":0,"goodreads_ratings_count":6727,"goodreads_reviews_count":329,"quality_score":0.933}}