My number one pick would have to be Carol Martin's "...blah blah blah....
I think you're right, given what an incredibly short amount of time visitors have, we probably still have to punch up the Homepage a bit.
I hate to say this, but it might be best to go with a version of my current page. I think that a few short, punchy quotes will help me more than anything. This is the homepage of a super seller whose work I admire:
https://christinabakerkline.com/ She appears to favor this approach.
Neil, I truly apologize that I didn't have this visualized earlier. I'm afraid I had to see it in real life to figure it out. Looking at the advance praise, those quotes together give a pretty good idea of what the book is about. It might be better to have a Learn More button for the book description.
I hope this doesn't frustrate you since what you've created is so lovely. Obviously, I'm not a great supervisor!