Lirael, a young woman living in the isolation of the Abhorsen’s library, must confront a dark, ancient force threatening the Old Kingdom. Lirael struggles with her lack of magical ability and her status as an outsider within the Clayr’s Glacier, where she serves as an assistant librarian. Her objective is to uncover the truth about her heritage and her purpose, a task complicated by the presence of a mysterious, sarcastic talking cat named Mogget. As she navigates the dangerous, shifting geography of the Old Kingdom, she faces malevolent entities that seek to break the boundary between the living and the dead. The narrative follows her development through a third-person perspective that emphasizes the atmospheric and often perilous nature of her environment.

Readers frequently highlight the unique magic system as a standout feature of the narrative. Discussion often centers on the contrast between the technological world of Ancelstierre and the high-fantasy setting of the Old Kingdom. Critics often note the pacing is deliberate, allowing for significant character growth as Lirael transitions from an insecure librarian to a capable practitioner. The atmosphere is consistently described as somber and immersive, providing a distinct tone that separates it from other works in the genre. Many readers appreciate the balance between the internal development of the protagonist and the external threats posed by the necromantic forces.