In case you aren't aware, this site reveals books you can download for free... (Many for a limited time.)
https://www.ereaderiq.com/freebies
They're books you download from Amazon.com (so you'll require an account, which is free)...
Why would people give away their valuable books for free?
One reason could be that they are fishing for some positive reviews...
Another reason could be that they want to "hook" you - so you can't help yourself and you'll want to read (and buy) some of their other books, too!
Either way, it's a good resource to be aware of...
Both fiction and non-fiction books are listed!
Best wishes,
Dien