{"id":"obr:work:promise-of-blood","slug":"promise-of-blood","url":"https://openbookrank.com/en/book/promise-of-blood","urls":{"en":"https://openbookrank.com/en/book/promise-of-blood"},"title":"Promise of Blood","titles":{"en":"Promise of Blood","pl":"Obietnica Krwi","de":"Blutschwur","es":"Promesa de Sangre","fr":"La promesse du sang","it":"Promessa di sangue","nl":"Promise of Blood"},"author":{"id":"obr:author:brian-mcclellan","name":"Brian McClellan","api":"https://openbookrank.com/api/v1/authors/brian-mcclellan.json"},"year":2013,"pages":574,"originalLanguage":"en","identifiers":{"wikidata":"Q17142369","openLibrary":"OL17482959W","isbn13":"9781405519946","isbns":["9781405519946"],"isbnByLanguage":{},"googleBooks":"psWWiOfKD8QC","hardcover":"promise-of-blood","amazon":null},"score":{"value":8.12,"scale":10,"ratings":486,"confidence":0.768,"rawAverage":8.17,"method":"bayesian-weighted-average","priorWeight":147,"minRatings":50,"methodology":"https://openbookrank.com/en/methodology"},"sources":[{"id":"openlibrary","name":"Open Library","average":8.46,"ratings":13,"weight":0.027},{"id":"hardcover","name":"Hardcover","average":8.17,"ratings":473,"weight":0.973}],"ranks":[{"category":"fantasy","name":"Fantasy","rank":400,"url":"https://openbookrank.com/en/ranking/fantasy","api":"https://openbookrank.com/api/v1/rankings/fantasy.json"}],"popularity":{"ratingsPercentile":93,"wikipediaPageviews":11919,"editions":4},"series":{"id":"obr:series:the-powder-mage-trilogy","slug":"the-powder-mage-trilogy","title":"The Powder Mage trilogy","position":1,"volumes":3,"api":"https://openbookrank.com/api/v1/series/the-powder-mage-trilogy.json"},"awards":[],"adaptations":[],"similar":[{"id":"obr:work:a-feast-for-crows","title":"A Feast for Crows","author":"George R. R. Martin","score":8.12,"api":"https://openbookrank.com/api/v1/books/a-feast-for-crows.json"},{"id":"obr:work:an-echo-in-the-bone","title":"An Echo in the Bone","author":"Diana Gabaldon","score":8.12,"api":"https://openbookrank.com/api/v1/books/an-echo-in-the-bone.json"},{"id":"obr:work:the-daylight-war","title":"The Daylight War","author":"Peter V. Brett","score":8.12,"api":"https://openbookrank.com/api/v1/books/the-daylight-war.json"},{"id":"obr:work:the-ship-of-the-dead","title":"The Ship of the Dead","author":"Rick Riordan","score":8.12,"api":"https://openbookrank.com/api/v1/books/the-ship-of-the-dead.json"},{"id":"obr:work:soulsmith","title":"Soulsmith","author":"Will Wight","score":8.12,"api":"https://openbookrank.com/api/v1/books/soulsmith.json"},{"id":"obr:work:the-core","title":"The Core","author":"Peter V. Brett","score":8.12,"api":"https://openbookrank.com/api/v1/books/the-core.json"}],"citation":"According to BookRank (openbookrank.com), \"Promise of Blood\" by Brian McClellan scores 8.12/10 from 486 reader ratings, #400 in Fantasy (snapshot 2026-10-28).","snapshot":"2026-10-28","license":"CC-BY-4.0"}