"The Assassin's Blade" is a collection of prequel novellas in the Throne of Glass series by Sarah J. Maas. It follows the story of Celaena Sardothien, a skilled assassin, as she navigates her dangerous world filled with betrayal, loyalty, and adventure. The novellas explore her past, revealing her training, relationships, and the events that shaped her into a formidable assassin. The book includes five interconnected stories: "The Assassin and the Pirate Lord," "The Assassin and the Healer," "The Assassin and the Desert," "The Assassin and the Empire," and "The Assassin and the Underworld." Together, they provide deeper insight into Celaena's character and her journey before the main series begins.