My latest writers' group meeting ended in a three cornered discussion on writing the dreaded synopsis. I say dreaded, because I don't recall ever meeting an author who greeted the idea with anything less. It doesn't matter if it is for a book as yet unwritten, or incomplete, or one that is finished - although both have their own unique problems. For a book that is not finished the dilemma is significantly: 'How the heck do I know what is going to happen? I'm only writing the thing.' The plot might take all sorts of turns before we reach the end. The characters might wander off in their own path, with the hapless author running along behind, waving their arms and yelling, 'You're supposed to be going that way.' (Take it from me - it never works.)
In the case of the finished book you know what happened but there is the terrible task of shoe horning your wonderful, intricate work of art into a measly single page, single spaced, and plenty of white space, so it looks good as well as reads well. Hah!
Authors who write novels are mostly not well adjusted to short pieces.
In finished and unfinished there is a matter of selection - do you mention that sub plot about the brother, and the best friend - and what about the dog. (Yes, that was me, a few weeks ago.)
I haven't done a synopsis for long time - until I did one a few weeks ago for the agent/editor round that is part of the Romantic Novelists' Association conference. It probably did me good to stretch my brain. I can't say that it will totally reflect the book that finally comes out, but it is an approximation, I hope. And no, I didn't mention the brother, or the dog. Any one reading the first few thousand words will find out about them fairly quickly. A synopsis is all about making your words count. That three cornered discussion was interesting - take away points, focus on the main story, make sure you reveal the ending, the agent/editor wants to know that you have a finish line in mind - OK, so it might not be quite the one you first thought of ...
The other thing that occurred to me was the using your words thing. The right choice can convey chunks of the plot without the detail. A character demanding something instead of asking or requesting says a whole lot about the situation, the relationship. the character themselves - all in one word. So, you have to weigh them and make them count, carrying as much load as they can, but without making it sound over blown, or a melodrama - which is why writing a synopsis is so damn hard!

