I found myself in that exact spot last month, trying to track down a free version of 'Alpha Asher'. Honestly, most of the big platforms like Amazon Kindle, Apple Books, and Google Play Books only offer it for purchase or through their subscription services. That’s the legal route, anyway. You could check if your local library uses an app like Libby or Hoopla; sometimes they have digital copies you can borrow for free with a library card. That’s how I read it.
Outside of that, I’d be really wary of any site promising the full book for free. A lot of those are either scams, have terrible formatting, or are just flat-out piracy. The author and publisher put work into it, you know? The subscription model on something like Kindle Unlimited might be the cheapest legal access if you plan on reading a few books a month, but for a single book, the library is your best shot.