It’s probably the single most despised document you might be asked to prepare: the synopsis.
The synopsis is sometimes necessary because an agent or publisher wants to see, from beginning to end, what happens in your story. Thus, the synopsis must convey a book’s entire narrative arc. It shows what happens and who changes, and it has to reveal the ending. Synopses may be required when you first query your work, or you may be asked for it later.
Don’t confuse the synopsis with sales copy, or the kind of marketing description that might appear on your back cover or in an Amazon description. You’re not writing a punchy piece for readers that builds excitement. It’s not an editorial about your book. Instead, it’s an industry document that helps an agent or editor quickly assess your story’s appeal and if it’s worth them reading the entire manuscript.