Discovering free e-books

I enjoy sitting on the deck and perusing a good book. Recently I have discovered free e books. I simply download them to my Asus tablet and begin reading. Now, after reading a page or two, I discover why some of them are free! (In fact, I should be paid for reading them). I've read a post Civil War book set in Boston, a semi comedic novel in which the main character escapes and gets recaptured eight or ten times from undercover agents, a truly wonderful children's book about a girl who finds things. The author included "things to find" at the end of the book.