Every few weeks a writer sends me a manuscript with an apology attached. They got to somewhere around the middle and stopped, and they cannot say exactly why. The opening was fun. The ending is clear in their head. Somewhere between the two, the road washed out.
I have read enough of these to tell you that the stopping place is nearly always the same. It is the long stretch after the setup has paid out and before the ending has started to pull, somewhere between chapter twelve and chapter twenty in most books. Nobody expects to know what they are doing in chapter two, and the last act runs downhill on its own. The middle is where you have to make your own weather. It is the stretch where most books go to die.
Here is what is happening in that stretch, and then here is what to do about it.
What the middle is for
The beginning of a novel makes a promise. A man finds a body behind the warehouse. A woman inherits a house she never wanted. The middle is where the promise gets expensive. Your character tries the easy thing and it fails. They try the harder thing and it costs them something. Somebody they trusted turns out to be somebody else. Every attempt should close a door and open a worse one, so that by the time the last act starts they cannot go back to who they were on page one, even if they want to.
Most stalled middles are stalled because the writer is being kind. The character wants something and the writer keeps letting them have a little of it. The stakes sit right where they were in chapter five. Scenes happen, but nothing turns. The reader can feel the engine idling, and so can you, which is why you stopped.
The three lines
When a writer tells me they are stuck, I give them a short piece of homework before we talk. Take a sheet of paper. On the first line, write what your main character wants, in one sentence. On the second line, write the last thing they did to get it. On the third line, write what it cost them.
Nine times out of ten, the third line is blank. The attempt happened, but nothing was lost. Fill in that line and the book usually starts breathing again on its own, because a cost creates a new problem, and a new problem is your next scene.
Turn something over at the halfway mark
Near the middle of the middle, the story needs a reversal, a moment where what the character believed about their situation turns out to be wrong, or where they get the thing they wanted and discover it was the wrong thing. In a mystery, the prime suspect turns up dead. In a love story, the wedding gets moved up. The job of the midpoint is to change the question. Before it, the character is asking how do I get this. After it, they are asking what have I done.
If you cannot find your midpoint, that is probably the whole problem. Sit with it until you can name the moment the ground shifts under your character. Then write toward it.
Skip ahead, then come back
Sometimes the honest answer is that you do not know what happens in chapter fourteen, and staring at it will not help. Write chapter eighteen instead. Write the scene you have been looking forward to since you started. The gap will fill in behind you, because once you know what the character has to be feeling on the far side of it, you will know what has to happen to get them there. Novels do not have to be written in order. They only have to be read that way.
Do not start over
The most dangerous thing a stuck writer can do is go back to page one and start polishing. It feels like work, which is the trouble with it. It is a way of not writing the middle. Leave the early chapters alone until the draft is done. They will need rewriting anyway once you know how the book ends, and you will not know how it ends until you get there.
Somewhere in your files there is a book that stopped between chapter twelve and chapter twenty. Open it tonight. Write the three lines. I would bet you the price of a cup of coffee that the third one is blank, and I would bet the same cup that once you fill it in, you will want to write tomorrow.