I hate that question! It’s a great question but it’s impossible to answer.
Are you asking for a plot summary or a dissertation about the meaning of the book?
If I could answer the question in one sentence or one paragraph, I wouldn‘t need to have spent 15 years writing and rewriting the manuscript of my novel.
It’s an eminently reasonable question, though. I ask it all the time.
I need to be able to talk and write about my novel. There’s call for a one-liner, an elevator speech, a pitch to agents and publishers, a website description, and book jacket copy. All of these versions are different.
I’m still trying to figure out what my novel is about. Considering a variety of images for the cover, though, forced me to get closer to the essence of this book.
Next time, maybe someone will say, “Tell me about your book.” I like that much better than “what’s your book about?”