A sci-fi saga runs on a clock and a rulebook: a chronology of events and dates, and a tech system that has to obey its own physics across every book. When the math or the rules drift between books, readers catch it. StoryHelm reads your whole series at once and flags the timeline and tech contradictions before they ship.
Science fiction asks the reader to trust two invented structures at once. The first is chronology: how many years passed between the colony ship's launch and the war, how old the captain is now versus the prologue, what "a decade after the Collapse" actually lands on. The second is the rulebook: what the FTL drive can and cannot do, what the ship AI is allowed to know, how much energy a railgun draws. Both have to stay true not just inside one book but across the whole run, and that is exactly where they slip.
The pressure is scale. A space opera spans years, sometimes centuries, across multiple worlds and ships, with a cast that ages and a technology that gets described a little differently every time it appears. By Book 4 you are writing from memory of a rule you set in Book 1, and memory rounds the edges. The jump drive that needed a nine-hour charge gets a free fold because the rescue has to land on time. A character who was twelve at the founding is suddenly old enough to have fought in a war that happened eight years later. None of it looks wrong in the scene you are drafting, because the scene that contradicts it is two books behind you.
The shape is always the same: a hard limit set early, treated as real, then dropped when a later scene needs the exit. Here is a jump drive established in Book 1 as fuel-hungry and slow to charge, the constraint the crew plans an entire escape around:
Read alone, the Book 4 passage is a clean chase beat. Read against Book 1, it deletes the single-fold fuel limit and the nine-hour charge that powered the earlier book's suspense, and it does so silently, with no upgrade installed and no reason given. A reader who watched the crew sweat those nine hours now has nothing to fear from any later jump, including the ones in the book they already finished. The break is invisible to the author drafting Chapter 11, because the rule it contradicts lives 300 pages and three books behind.
StoryHelm reads your whole saga at once, the prose you wrote in its built-in editor and the books you imported from elsewhere, and turns it into a structure you can check. The Timeline agent pulls every event, date, and "X years ago" reference out of all your books and assembles one chronology, so a founding date in Book 1 and a character's stated age in Book 4 are checked against each other, not against your memory. The World Rules agent records each tech and physics rule you establish, an FTL charge time, an AI limit, a weapon's capability, with the exact book and chapter where it became canon. When a later scene breaks one, the Coherence Guardian links both passages side by side: the rule and the break, each pinned to its chapter. All of it lives in your Canon and Series Atlas, the shared source of truth across the run, so the saga stays consistent as it grows.
StoryHelm is a one-stop workspace: write your saga in the built-in Scene Editor or import finished books, and the same engine reads them. It is a multi-agent system, 41 specialized agents across 7 workflows powered by Claude, that reads your entire series and builds the timeline and the rules ledger this page describes. When the Timeline or World Rules agents find a date that does not add up or a drive that stopped obeying its own physics, the Coherence Guardian shows you both passages with book and chapter. StoryHelm reads and analyzes; the AI never drafts or rewrites a word of your prose, and it never decides which version is right, it tells you the two passages disagree, and you choose which one wins.
Yes. The Timeline agent reads events, dates, and "X years ago" references out of every book and assembles one chronology, then flags where the order or the math does not hold across the series.
Yes. The World Rules agent records each tech or physics rule you establish, an FTL charge time, an AI limit, a weapon capability, and the Coherence Guardian flags a later book that ignores or contradicts it.
No. StoryHelm reads and analyzes only. It shows you the two passages that disagree, with book and chapter; the fix and the words stay yours.
Yes. The Series tier ($59/mo) covers unlimited books under one Canon, with a 14-day free trial (no card) and a one-time $99 Manuscript Audit.
Import your saga and StoryHelm builds one chronology and reads your tech rules into Canon, then flags the date or the drive that stopped obeying its own physics.
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