The Rithmatist — The Rithmatist, Book 1

The Rithmatist Review

The Rithmatist is Brandon Sanderson writing a young adult mystery set in an alternate-history America where the United States is the United Isles, where steam-powered automatons are everywhere, and where a small, selected group of students can draw geometric figures in chalk that come to life as soldiers and defensive constructs. It is also one of the most purely fun books he has written — lighter in register than his epic fantasy, tightly plotted, and built around a magic system so visual and tactically interesting that Sanderson includes in-text diagrams.

Joel attends Armedius Academy on scholarship as the son of a deceased chalk-maker — he has encyclopedic knowledge of Rithmatics, the theoretical underpinning of the magic, but was not chosen as a Rithmatist at the required ceremony and so cannot practice it. He is the rare Sanderson protagonist who wins through intellect and obsessive study rather than latent power eventually unlocked, and the narrative shape of his arc — the outsider who understands the system better than the insiders — is more interesting than the chosen-one structure his position in the story might have invited.

When Rithmatist students begin disappearing from the academy, Joel becomes involved in the investigation through his relationship with Professor Fitch, a Rithmatist scholar whose theoretical brilliance is not matched by combat ability. Their partnership gives the mystery a pleasingly mismatched-detective dynamic, and the investigation itself is constructed fairly — the clues are there to be found.

The magic system is the novel’s signature achievement. Rithmatic combat involves drawing Lines of Warding, Lines of Forbiddance, and Chalklings — animated chalk figures that attack and defend — with the geometric precision of the drawings determining their power and durability.

Reading Order / Cosmere Placement

The Rithmatist is not part of the Cosmere. It is a standalone YA fantasy set in its own universe. No Cosmere knowledge is required or relevant. A sequel has been planned for years but remains unpublished as of 2026.

Our rating: 4.3/5 — A clever, visual, and engrossing YA fantasy with one of Sanderson’s most elegant magic systems and a mystery plot that earns its resolution.

Reading Guides

• Brandon Sanderson Books in Order: The Complete Cosmere Reading Guide (2026)

The Visual Magic System

The chalk-based magic of The Rithmatist is Sanderson’s most inherently visual magic system, and he responds to this by including in-text diagrams — actual illustrations of Lines of Warding, Lines of Forbiddance, and Chalkling configurations. This is unusual for a fantasy novel and reflects the fact that Rithmatic combat is spatial and geometric in ways that prose description alone cannot fully convey.

The diagrams serve a narrative purpose beyond illustration: they make the reader a participant in the tactical analysis rather than simply a spectator. When a Rithmatist draws a defensive configuration, readers who have studied the diagrams can actually evaluate whether the defense is well-constructed, whether the lines of attack are covered, whether the Chalklings are positioned strategically. This is Sanderson’s First Law applied at the most literal level: the reader understands the magic well enough to have opinions about its use.

The Alternate History United Isles

The world of The Rithmatist is one of Sanderson’s most carefully constructed alternate-history settings. The United Isles of America — an archipelago nation whose history diverged from ours at a point involving both religious and political changes — is internally consistent in ways that alternate history requires: the changes from our history are not cosmetic but structural, shaping the culture, economics, and politics of the world in ways that feel generated rather than imposed.

The presence of steam-powered automata (clockwork mechanical assistants that run on a literal steam-clock infrastructure), the specific religious practices around Rithmatic choosing ceremonies, the relationship between Armedius Academy and the broader society — these details build a world that feels inhabited rather than sketched.

The Unfinished Series

The honest caveat that any review of The Rithmatist must include: the sequel has not been published, and as of 2026 it remains unwritten in any form that Sanderson has acknowledged. The novel ends in a way that clearly sets up a larger story — the mystery of the Wild Chalklings, the origin of Rithmatics, Joel’s relationship to the system — and that story has not been told.

This is an unusual situation for Sanderson, who typically finishes his series. He has said the sequel remains planned but has been consistently deprioritized by the demands of the Cosmere and the Skyward series. Readers approaching The Rithmatist should know this in advance: it is an excellent first volume whose follow-up may be a long time coming.

Joel and the Non-Powered Protagonist

The choice to make Joel a non-Rithmatist who nonetheless understands Rithmatics better than most Rithmatists is the novel’s most interesting structural decision. He wins not through power eventually unlocked or discovered ability finally recognized but through the same intelligence and obsessive study that characterizes him from page one. The mystery is solved because he is good at thinking carefully about evidence.

This is a model of YA protagonist that is rarer than the chosen-one structure, and it produces a character whose satisfaction is genuinely different from power fantasy.

Professor Fitch and the Mismatched Detective Partnership

The partnership between Joel and Professor Fitch — the gentle, theoretically brilliant Rithmatist scholar whose combat abilities are insufficient for a direct confrontation with the killer — is the novel’s best character dynamic. Fitch represents a specific kind of intelligence: deep expertise combined with practical limitations, the scholar who understands the system better than anyone but cannot translate that understanding into direct action.

Joel’s outsider knowledge and Fitch’s insider expertise complement each other in ways that make the investigation more interesting than either could manage alone. Their dynamic also raises the series’ most pointed question about meritocracy: the Rithmatic system, which selects students based on a ceremony rather than ability or effort, has excluded the person who would most benefit from formal training. Joel’s outsider position is not merely a narrative convenience but a commentary on how systems of selection often fail their own stated purposes.

Rithmatics as Tactical Game

The diagrams Sanderson includes in the text — showing the geometric configurations of Lines of Warding, Forbiddance, and Vigor — are genuine tactical puzzles that readers can engage with as such. The circles and lines of a defensive Rithmatic configuration are a strategic problem with optimal solutions, and Sanderson designed them to be legible enough that the diagrams contribute to the analysis rather than merely decorating the page.

This places The Rithmatist in a small category of fantasy novels where the magic system is complex enough to be genuinely interesting as a game — where understanding the rules well enough allows the reader to evaluate character choices rather than simply observe them.