Synopsis writing is different than writing a book.  I’ve heard many say it’s the hardest thing they’ve ever had to write.  I always write mine from a working outline that I make sometime during the novel process.  It makes it much easier for me.  But, I certainly appreciate any advice I can get on the subject.

I found a great posting for writing a synopsis:  How to Write a Synposis.  This site had all kinds of goodies, besides that article.  So, take some time and investigate.