This is the simplest return/refund policy you’ll ever see (especially one written by a lawyer):
If you’re not happy, I’m not happy.
If for ANY reason you want a refund because you’re not happy with your book that you purchased through this website, simply email me at firstname.lastname@example.org within 30 days after purchase, tell me that you want your money back, give me your order number, and I’ll refund your order. It’s that simple! I won’t even make you ship back the book – there’s no need to waste shipping costs and effort. Instead, give the book to someone else who might enjoy it.