Harrow the Ninth is Tamsyn Muir's audacious follow-up to Gideon the Ninth, and it's simultaneously brilliant and frustrating. This is a book that actively works against its readers—Muir employs an unreliable narrator, timeline jumps, and deliberate misdirection that will leave you questioning everything you think you know about Harrowhark Nonagesimus and her world of bone magic.

The book excels at psychological horror and emotional devastation. Harrow's deteriorating mental state drives the narrative as she grapples with memory loss, guilt, and the weight of becoming a Lyctor. Muir's prose remains sharp and darkly funny, though the humor is more bitter than the meme-filled banter of the first book. The relationship between Harrow and Gideon—even in Gideon's absence—forms the emotional core, and when the truth finally emerges, it's genuinely heartbreaking.

Where the book stumbles is accessibility. The deliberate confusion serves the story's themes but creates a reading experience that feels like work. Multiple timeline shifts, the second-person narration sections, and Harrow's unreliable perspective make plot threads difficult to follow. Characters like Ianthe and Coronabeth feel underdeveloped compared to their potential, and the pacing drags significantly in the middle sections as Harrow navigates the Emperor's house.

This book is for readers who loved Gideon the Ninth and are willing to trust Muir through a much more challenging narrative. It rewards careful readers and benefits from rereading, but it's not for anyone seeking straightforward storytelling. Skip this if you prefer linear plots, found the first book's worldbuilding already too dense, or want immediate answers to your questions.

The payoff is worth it for patient readers. When Muir's puzzle pieces click together, the emotional impact is devastating. The book's exploration of grief, sacrifice, and love transcending death elevates it beyond clever narrative tricks. Just be prepared for a reading experience that demands your full attention and forgiveness for its deliberate obtuseness.