I'm not sure if this is the right forum to ask this, but how does writing a novel treatment work? I've written the first two books in a trilogy and have been shopping them. The third book is still in progress and I've got a vague plan for it. Someone told me that, if the first book is picked up, the publisher/agent might want to see Book 2 and also a treatment for Book 3. I'm not sure if this is true (or how a three-book deal would work - would you have to show a plan?), but anyway, it got me thinking, what counts as a treatment for a novel? Would it be a chapter by chapter list (maybe in bullet points) with a couple of lines about each chapter? Or would it be like a detailed synopsis, a few pages outlining the story from beginning to end? Or a combination of both?