Throne Of The Crescent Moon by Saladin Ahmed

In a richly imagined, Arabian Nights–inspired world, an aging, hard-bitten ghul-hunter and his quick-witted young protégé are drawn into a desperate quest when a surge of dark magic and ritual killings threatens their city; joined by a fierce, politically driven warrior, they must confront ancient monsters, ruthless conspirators, and the moral costs of violence, faith, and loyalty as shifting alliances and long-buried secrets about the region’s past are revealed.

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