I hate synopses, and I've never managed to write one. How the hell can you boil down a novel from 400 pages to three?
And what does the reader of a synopsis expect to learn from it, anyway? I'm not nearly good enough a writer to convey tone, voice, and character and summarize a 90,000-word plot in five paragraphs. Someone who writes in romance told me that the synopsis is used to prove you understand the expectations of the genre. Well, okay, I guess. But I've never heard another good reason, and even that sounds weak to me.
If the publisher's demand for a synopsis in nonnegotiable, do the best you can. Otherwise, just skip it--attach Chapter One, or a list of writing credits, instead. For me, the whole point of the game is to get them to read the first few pages. After that, it's all about the writing, as it should be.
Michael Wiecek