If you are seeking a publisher or planning to self publish you will need a synopsis. Writers freak out at the word “synopsis” when it just means “summary.” Many editors require a synopsis (that reveals the ending) to help them judge a submission. Plus, as an author, you will have to summarize your work when people ask, “What is your story about?”
I can help you improve your current synopsis or draft one for you. If I have to draft the synopsis from scratch, that requires my reading the entire manuscript; therefore, the manuscript should be in its final, edited draft.
With regard to my services, the term “synopsis” is not to be confused with “chapter summary.” The synopsis will be written in essay style and not an individual summary/breakdown of each chapter. I can edit or create a chapter summary in addition to or instead of a synopsis if you prefer.
I believe a full synopsis should be no more than 1% of the final word count of the manuscript. For example, if you have a 70k word manuscript, you should aim to have a complete synopsis (summary) in 700 words—give or take a little, but not much. The synopsis should be coherent and compelling.
Blurbs are different than a synopsis because they are geared towards promotion. Yes. Promotion. If you are at the stage where you are seeking professional editorial help, you need to think about what will happen after publication. Your blurb may possibly double for your back cover text. I will help you summarize your work in approximately 25/50/75/150 words because you will need blurbs in various lengths depending on their planned use.