My book is about a sleepy Devon village and is a compilation of tales that feature over thirty characters. They weave in and out of each other's stories, in the pub, Post Office and village shop etc. I had an old lady read it to see if it was too complicated but she had no problems keeping up. How can I write a synopsis for so many using only 300 words?
What is your book about, really? Not "a Devon village". Is it about relationships? Is it about the skeletons in people's closets? Is it about the tiny day-to-day bits of kindness people do for each other?
Answer to yourself what your book is really about, then structure your synopsis around that. For example, if your book is about the skeletons in people's closets, you could start with something along the lines of:
This story takes place in a quiet Devon village. But under the peaceful surface, every man is hiding something. As they weave through each others' lives, old secrets are revealed...
At the core of your story is not a place or a character, but an idea. Formulate your synopsis around the idea. Tell a little of how the idea is expressed by means of the settings, the characters, etc.