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Gideon the Ninth (The Locked Tomb, #1) by Tamsyn Muir - Summary

Gideon the Ninth (The Locked Tomb, #1) by Tamsyn Muir - Summary
One-Sentence Summary:

Gideon the Ninth by Tamsyn Muir is a genre-defying, darkly humorous science-fantasy novel about Gideon Nav, a swordswoman who is unwillingly paired with her necromancer nemesis, Harrowhark Nonagesimus, to solve a deadly puzzle in a haunted, gothic palace where failure means certain death.


Book Information:
Title: Gideon the Ninth
Author: Tamsyn Muir
ISBN: 978-1250313188
Genre: Science Fiction, Fantasy, Gothic, Horror
Published: 2019


Detailed Summary of Gideon the Ninth

In Gideon the Ninth, the first book in The Locked Tomb series, Tamsyn Muir introduces readers to a world where necromancy, loyalty, and rivalry intersect in a suspenseful and darkly comedic tale. Following Gideon Nav, a skilled swordswoman, and Harrowhark Nonagesimus, her rival and necromancer, the story combines high-stakes intrigue, humor, and mystery as the two protagonists are thrust into a deadly contest to achieve immortality for their dying Ninth House.


1. Setting and Background

The story is set in a science-fantasy universe divided into nine Houses, each possessing unique necromantic abilities. This interstellar empire, known as the “Nine Houses,” worships a god-emperor who, centuries ago, granted his followers mastery over death and reanimation. However, these Houses also exist in rivalry, each House serving its own purpose but harboring a complex and often hostile relationship with one another.

  • The Ninth House is a decaying, isolated society known for its mastery over death and dedication to guarding the Locked Tomb—a mysterious and sacred crypt. As the Ninth House’s last necromancer, Harrowhark Nonagesimus bears the weight of her House’s honor, while Gideon Nav, a swordfighter and servant raised as an orphan in the Ninth, chafes under her forced servitude and dreams of escape.

2. Main Characters

  • Gideon Nav
    Gideon is an orphan, raised in the Ninth House, who has a brash, irreverent personality, matched with expert skills in swordsmanship. She resents her life of servitude and Harrow’s authority over her. Gideon’s dry humor and cynicism bring levity to the novel, and her reluctant journey to become Harrow’s bodyguard becomes one of personal growth as she faces both supernatural threats and the depths of her complex relationship with Harrow.

  • Harrowhark Nonagesimus
    Harrow is the last necromancer of the Ninth House, a talented yet troubled soul devoted to preserving her House. Driven by ambition and duty, Harrow’s motivations are hidden beneath layers of formality and resentment toward Gideon. Her cold, calculating nature makes her enigmatic, but as the story unfolds, her vulnerabilities and insecurities reveal her as a deeply complex character who grapples with her responsibilities.

  • The Lyctors and Competitors
    As the god-emperor’s most powerful necromancers, known as Lyctors, approach the end of their lifespans, the competitors in the emperor’s deadly trials are selected from each of the Nine Houses. These contestants, along with their respective cavaliers, must work through challenging puzzles and trials within Canaan House, the gothic palace where the story takes place.


3. Plot Summary

Gideon’s Plan to Escape the Ninth

The novel opens with Gideon’s frustrated attempts to escape the Ninth House and begin a new life, far from the misery of her upbringing. Despite being foiled in every escape attempt by Harrow, Gideon is determined to leave. However, her freedom is cut short when Harrow offers her a proposition: if she serves as Harrow’s bodyguard in the emperor’s challenge at Canaan House, she’ll be granted her freedom afterward.

Reluctantly, Gideon agrees. Though she despises Harrow, the promise of freedom is too tempting to resist. This reluctant alliance marks the beginning of their fraught partnership as they journey to Canaan House, the emperor’s ancient, decaying palace where necromancers and cavaliers from each House are assembled.

Quote: “I am, unfortunately, Gideon the Ninth.”

Arrival at Canaan House: An Invitation to Death

At Canaan House, Gideon and Harrow meet their competitors: pairs from the other Houses who range from rivals to potential allies. However, it soon becomes apparent that the trials at Canaan House are anything but straightforward. Each pair must uncover secrets, solve puzzles, and gain mastery over increasingly dangerous necromantic powers to achieve “Lyctorhood,” a form of immortality bestowed by the emperor.

The stakes rise as the other competitors begin to die mysteriously, hinting at the haunted nature of Canaan House and the dangers lurking within its ancient walls. Gideon and Harrow quickly realize that survival depends on their ability to work together, despite their longstanding animosity.

Quote: “You will die here…if you’re lucky.”

The Dangerous Games of Canaan House

The trials at Canaan House test not only the necromancers’ magical prowess but also the cavaliers’ loyalty and skill in combat. Gideon’s skills with a sword become crucial as she and Harrow navigate increasingly perilous encounters, both physical and supernatural. Their forced partnership shifts from one of reluctant cooperation to a deeper, albeit tense, connection as they rely on each other’s strengths.

The duo’s progress within the trials is hindered by rivalries, shifting alliances, and the looming threat of betrayal. Harrow’s ruthless ambition contrasts sharply with Gideon’s more straightforward personality, leading to clashes that threaten to unravel their already precarious alliance. The labyrinthine corridors and eerie atmosphere of Canaan House heighten the tension, as each encounter brings new revelations and questions.

Unraveling the Secrets of Lyctorhood

As the competitors dwindle, Gideon and Harrow discover the horrific truth behind Lyctorhood: it involves a gruesome sacrifice that demands the life of the cavalier, merging their life force with that of the necromancer. This revelation shakes Gideon to her core, and she confronts Harrow about the implications of this sacrifice, feeling betrayed and conflicted.

Quote: “Is it worth it, Harrow, if you have to kill to achieve it?”

The journey to immortality proves more haunting and ethically challenging than either anticipated. Despite this, Harrow is resolute in her determination to complete the trials and secure her House’s survival, while Gideon is torn between her loyalty to Harrow and her desire for her own life.

The Final Battle and Revelation of Harrow’s Secrets

As they approach the final stages of the trials, the threats within Canaan House intensify, leading to a climactic battle against a powerful necromantic entity. Gideon and Harrow’s teamwork is pushed to its limits as they confront the supernatural forces within the palace, and Gideon ultimately sacrifices herself to save Harrow, fulfilling her role as cavalier in a selfless act of loyalty.

In the aftermath of Gideon’s sacrifice, Harrow is forced to confront her own emotions, realizing the depth of her connection to Gideon. The story concludes with Harrow achieving Lyctorhood, now bearing both the powers and the weight of Gideon’s life force, setting the stage for the next chapter in her journey.

Quote: “I’ll be right there with you, till the end.”


4. Themes in Gideon the Ninth

Loyalty and Sacrifice

The complex, often antagonistic relationship between Gideon and Harrow highlights themes of loyalty and sacrifice. While their relationship begins in hostility, their shared experiences in Canaan House reveal an unspoken bond and mutual dependence. Gideon’s sacrifice for Harrow underscores the themes of selflessness and duty, as she embraces her role despite her initial resistance.

The Quest for Power and Its Cost

Lyctorhood, the ultimate reward, symbolizes both the allure and the danger of absolute power. The price of Lyctorhood—requiring the cavalier’s life—poses moral questions about the sacrifices made in the pursuit of power and whether such a quest is justified.

Isolation and Belonging

Both Gideon and Harrow grapple with isolation, shaped by the traumatic experiences of their pasts and the oppressive nature of the Ninth House. Their partnership at Canaan House offers a semblance of belonging, and their shared struggles create a bond that fills the void left by their isolated lives, despite their differences.


5. The Climax and Resolution: Gideon’s Sacrifice and Harrow’s Transformation

The novel’s climax is marked by Gideon’s ultimate sacrifice to ensure Harrow’s survival, an act that cements their connection and solidifies the significance of their relationship. Through her sacrifice, Gideon becomes a part of Harrow, both literally and metaphorically, and Harrow achieves Lyctorhood, bearing Gideon’s life force within her.

The novel ends on a poignant note as Harrow is left to grapple with the implications of Gideon’s death and her new powers, setting the stage for her journey in the following installments. The revelation of Lyctorhood’s cost serves as a cautionary reminder of the sacrifices required in the pursuit of power.


Conclusion: A Darkly Thrilling Tale of Loyalty, Power, and Sacrifice

Gideon the Ninth by Tamsyn Muir is a masterful blend of science fiction, gothic horror, and dark humor. Through the unlikely partnership of Gideon and Harrow, the novel explores complex themes of loyalty, sacrifice, and the high cost of ambition in a haunting, vividly imagined universe. Gideon’s journey from reluctant ally to sacrificial hero is both compelling and tragic, while Harrow’s transformation leaves readers eager for the continuation of her story. Muir’s unique prose, filled with wit and suspense, makes Gideon the Ninth a standout entry in contemporary speculative fiction.


Short Summary Recap:
In Gideon the Ninth, Tamsyn Muir weaves a haunting and darkly humorous tale of necromancy, rivalry, and sacrifice as Gideon Nav and Harrowhark Nonagesimus face deadly trials to achieve immortality, leading to a profound transformation and a heart-wrenching act of self-sacrifice.

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