One of the biggest struggles I have (totally a first-world problem) is trying to sum up my unpublished novels in a short, sweet synopsis that will draw the reader in and make him or her want to read the whole book.
Writing advice/how-to books will tell you to look for examples of TV show and movie descriptions on Netflix and the back cover blurbs of popular books in your genre. These can help you build a short, professional-sounding pitch.
BookPage can also help. It’s a free (yay, free stuff!) magazine distributed by the local library that features reviews and descriptions of new and forthcoming books. (The online version is here.) Louise Penny’s The Nature of the Beast was described with this simple sentence:
When a 9-year-old boy known for crying wolf disappears, the villagers of Three Pines are faced with the possibility that one of his tall tales might have been true.
You can tell a lot about the story from reading this: you know the characters, the setting, and the conflict. You can guess at the genre (possibly suspense or mystery based on a fable, which could include some fantasy or supernatural elements). It’s just enough to pique the reader’s curiosity. I kinda want to read this book if the library purchases it.
Crafting the perfect synopsis is a kind of art, not unlike writing a haiku. Thankfully, there are tons of examples out there to guide you.