I've been hunting for free reads of Paulo Coelho's 'The Zahir' too, and I totally get the struggle. While I respect authors' rights, sometimes budgets are tight. Project Gutenberg is a great place for older classics, but 'The Zahir' might not be there since it's relatively recent. Some public libraries offer digital loans through apps like Libby or OverDrive, which is legal and free if you have a library card.
I’ve also stumbled upon sites like Open Library, where you can borrow e-books temporarily. Just be cautious with shady sites claiming 'free downloads'—they often violate copyright laws and might be unsafe. If you're into audiobooks, YouTube sometimes has free chapters, but full copies are rare. Supporting authors is ideal, but if you're in a pinch, library services are the best legit option.