The Layer Method
One sentence, expanded and divided until it is a book. This page is the whole mechanism: what each layer asks for, why the pattern alternates, and a worked example carried further than the homepage has room for.
The whole method fits in one sentence: a book is a sentence that you expand until it's a book. That is a mechanism, not a metaphor. Here is how it actually runs.
Layer 1: the seed
One sentence. Something happens to someone. It does not have to be a good sentence, only a true one, in the sense that it's the thing the book is actually about, stripped down to the smallest form that still has a pulse. You can't see the whole book from here, but it's already there, the way an oak is already there in an acorn.
Layer 2: the paragraph
Expand the sentence into a paragraph: sixty words at least, no ceiling. This is the floor doing its only job. Sixty words is enough that you can't get there by rephrasing the sentence, you have to actually add something. If the paragraph turns out to be the whole story, that's fine. You wrote a short story, and you stop there.
Layer 3: the branches
Read the paragraph back and pick out three or more sentences from it, each on its own line. This is the layer where the book stops being one thread and starts being a tree. Each sentence you marked is a branch you can grow independently of the others, and if one of them turns out to be a dead end, you drop it later. Nothing here is locked in.
Layer 4 and down: divide, expand, repeat
From here the pattern repeats and alternates. Odd layers divide: you pick sentences out of what you wrote. Even layers expand: you grow each of those sentences into something longer. Below layer three, "expand" stops meaning "write a paragraph specifically" and starts meaning "write however much this piece needs," which might be a sentence, might be a full scene.
Most books get long by branching, not by any single passage swelling past what it needs to be. Some branches stay four words forever and that's correct. They were never going to be more than a beat.
What "done" means
The book is whatever you wrote deepest on every branch. Anything above that, every outline sentence you never expanded, stays as outline and doesn't appear in the export. Worth knowing before you start: the method produces a finished manuscript out of only the leaves of the tree, not the scaffolding that got you there.
Five moves, then, repeated as many times as the book needs. There is no AI anywhere in that sequence. The only thing an automated reader ever does is check that a layer meets its floor before you're allowed to go on. You wrote every word of it.
The rules at each layer
Layer 1 is one sentence, under 30 words. Every even layer after it is an expansion with a floor and no ceiling. Every odd layer after layer 1 is a decomposition: at least 3 pieces pulled out of the passage above, each on its own line.
| Layer | Floor | Grain |
|---|---|---|
| Layer 2 | 60+ words | paragraph |
| Layer 4 | 80+ words | paragraph |
| Layer 6 | 105+ words | paragraph |
| Layer 8 | 135+ words | long paragraph |
| Layer 10 | 150+ words | long paragraph |
| Layer 12 and deeper | 150+ words | long paragraph |
The floor rises for the first few expansions, then holds at 150 words and stays there no matter how deep the book goes. There is a depth limit of 40 layers, but it is a guard against a corrupted tree recursing without end, not a shape the method is trying to give your book. Nothing about the method itself stops at any particular layer.
Why odd layers divide and even layers expand
A passage is either something you picked out of what you already wrote, or something you grew. Those are different acts, and the method keeps them separate rather than asking you to do both in one move.
Dividing turns one passage into several addressable pieces: sentences or blank-line-separated pieces you can each work on, drop, or reorder without touching the others. Expanding turns one of those pieces into prose. A book, on this method, is that pair of moves repeated as many times as the story needs: divide to find out what is actually inside a passage, expand to write the part that turned out to matter.
What happens below layer three
Layer 3 is the one odd layer where a piece is a single sentence. The paragraph above it is short, only 60 words at minimum, so a sentence is the unit that actually fits it. Every odd layer past that divides a passage with no upper length of its own, and holding it to one sentence would be the constraint fighting the layer above it rather than describing it. So from layer 5 on, a piece is whatever length it needs to be, blank line separated the same way sentences are at layer 3.
The word for it changes for the same reason: a layer-3 unit is a sentence, a layer-5-and-deeper unit is a piece. Same rule, a name that fits what it actually contains.
A worked example: the lighthouse keeper
The homepage shows a compressed version of this. Here it is with the reasoning at each step left in.
A lighthouse keeper finds a body on the rocks and does not report it.
One sentence, under the word limit, and it already has a decision buried in it: she does not report it. Everything below grows out of that one choice.
The storm had been running three days when Aoife found him, wedged in the rocks below the north gallery. She went down at first light with the boathook and did not use it. He was younger than her son and wearing a coat that had cost money. She stood in the spray a long time. There was the radio in the lamp room, and the mainland, and the questions they would ask her about the year she did not talk about. Then she climbed back up, made tea, and wrote nothing in the log for that day.
Past the floor, in the writer's own words, and nothing in it contradicts the seed. It adds who she is, what the body looks like, and the fact that she has a reason to avoid the radio.
The storm had been running three days when Aoife found him.
She went down at first light with the boathook and did not use it.
He was younger than her son and wearing a coat that had cost money.
She wrote nothing in the log for that day.
Four sentences pulled out of the paragraph above, each a branch that can grow on its own. The method does not pick which one matters. That is the writer's call, made here by choosing which sentence to expand next.
The gallery stair was slick and she took it the way she took everything now, one hand on the rail, counting. Sixty-one steps. At the bottom the wind came off the water hard enough to make her turn her face. When she turned it back he had not moved. She was still holding the boathook. She had carried it down to shift him into the water and she put it against the rock and left it there. The tide would do it or it would not. She went back up counting the same sixty-one and did not look down again.
This grows the second sentence, the one about going down with the boathook. The other three branches are still there, still one line long, waiting to be expanded or left alone. Whichever of them a chapter turns out to need gets the same treatment next.
The tree keeps going the same way past layer 4: divide what you wrote, expand the piece that turns out to carry weight, leave the rest as outline. This page stops at four layers for space. A real branch of a real book does not stop until the writer decides it is finished.
More on how the checks work is in the FAQ. What it costs is on the pricing page.