{"schema_version":"bf_book_companion_v1","release_id":"20260417T232332Z","book":{"amazon_purchase_url":"https://www.amazon.com/dp/B07Q3SNV7S?tag=bookfrontier-20","asin":"B07Q3SNV7S","authors":["Bradley Harper"],"book_id":"9781645060079","canonical_url":"https://bookfrontier.com/books/queen-s-gambit-B07Q3SNV7S","cover_image_url":"https://img.bookfrontier.com/9781645060079.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","description":"Spring, 1897. London. Margaret Harkness, now in her early forties, must leave England for her health but lacks the funds. A letter arrives from her old friend Professor Bell, her old comrade in the hunt for Jack the Ripper and the real-life inspiration for Sherlock Homes. Bell invites her to join him in Germany on a mysterious mission for the German government involving the loss of state secrets to Anarchists. The resolution of this commission leads to her being stalked through the streets of London by a vengeful man armed with a powerful and nearly silent air rifle who has both Margaret and Queen Victoria in his sights. Margaret finds allies in Inspector James Ethington of Scotland Yard and his fifteen-year-old daughter, Elizabeth, who aspires to follow in Margaret's cross-dressing footsteps. The hunt is on, but who is the hunter, and who the hunted as the day approaches for the Queen's Diamond Jubilee when the aged empress will sit in her open carriage at the steps of St Paul's Cathedral? The entire British Empire holds its breath as the assassin, Margaret, and the Queen herself play for the highest of stakes with the Queen's Gambit.","forthcoming":false,"isbn13":"9781645060079","publication_date":"20190917","publisher":"Seventh Street Books","slug":"queen-s-gambit","subtitle":"Kindle Edition","title":"Queen's Gambit"},"discovery":{"categories":{"all":[{"bisac_code":"FIC022060","confidence_band":"medium","label":"Historical Mystery","score":0.8193,"source":"bisac_hint_model"},{"bisac_code":"FIC031020","confidence_band":"medium","label":"Historical Thrillers","score":0.8085,"source":"bisac_hint_model"},{"bisac_code":"FIC022030","confidence_band":"medium","label":"British Mystery","score":0.79,"source":"bisac_hint_model"}],"hint":[{"bisac_code":"FIC022060","confidence_band":"medium","label":"Historical Mystery","score":0.8193,"source":"bisac_hint_model"},{"bisac_code":"FIC031020","confidence_band":"medium","label":"Historical Thrillers","score":0.8085,"source":"bisac_hint_model"},{"bisac_code":"FIC022030","confidence_band":"medium","label":"British Mystery","score":0.79,"source":"bisac_hint_model"}],"publisher":[{"bisac_code":"FIC014000","confidence_band":"high","label":"Historical Fiction","score":1,"source":"onix_publisher_code"},{"bisac_code":"FIC022060","confidence_band":"high","label":"Historical Mystery","score":1,"source":"onix_publisher_code"},{"bisac_code":"FIC031020","confidence_band":"high","label":"Historical Thrillers","score":1,"source":"onix_publisher_code"}]},"genres":[{"label":"Historical Mystery","score":0.8193,"slug":"historical-mystery"},{"label":"Historical Thrillers","score":0.8085,"slug":"historical-thrillers"},{"label":"British Mystery","score":0.79,"slug":"british-mystery"}],"reader_fit":["Good for readers who enjoy Historical Mystery","Good for readers interested in mystery","Good for fans of Historical Fiction"],"related_lists":[{"intro":"","slug":"shelf-fic022060-mystery-detective-historical","title":"Mystery & Detective Historical Books","url":"https://bookfrontier.com/lists/shelf-fic022060-mystery-detective-historical"}],"series":null,"similar_books":[{"authors":["Bradley Harper"],"book_id":"9781633884861","cover_image_url":"https://img.bookfrontier.com/9781633884861.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":26.7247,"title":"A Knife in the Fog","url":"https://bookfrontier.com/books/9781633884861"},{"authors":["Kate Reading","Sherry Thomas","Penguin Audio","& 0 more"],"book_id":"9780425281406","cover_image_url":"https://img.bookfrontier.com/9780425281406.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":19.3823,"title":"A Study in Scarlet Women","url":"https://bookfrontier.com/books/9780425281406"},{"authors":["Timothy Miller"],"book_id":"9781645060819","cover_image_url":"https://img.bookfrontier.com/9781645060819.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":17.2534,"title":"The Strange Case of the Pharaoh's Heart","url":"https://bookfrontier.com/books/9781645060819"},{"authors":["Gordon McAlpine"],"book_id":"9781633882072","cover_image_url":"https://img.bookfrontier.com/9781633882072.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":16.5411,"title":"Holmes Entangled","url":"https://bookfrontier.com/books/9781633882072"},{"authors":["Edgar Wallace"],"book_id":"9781952438714","cover_image_url":"https://img.bookfrontier.com/9781952438714.jpg?v=20260417T232332Z%3A2026-04-17T23%3A23%3A32Z","score":16.5014,"title":"The Dark Eyes of London","url":"https://bookfrontier.com/books/9781952438714"},{"authors":["A.E.W. 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