In the App the total book you can read more than 50 thousand books in addition in it you will also find audiobooks, art and music, I recommend it you can find it in the three bags of applications.

As you have been answered here is crossing a certain line that I have not quite clear how it is handled on Quora, what you can do is search on Google by adding keywords like PDF or ePUB for example: author's book + epub, if you find one that you can afford to pay, do it, it is the best way to support, but I would lie if I say that I have not resorted to search among the pages some link where I could find it for free, so it is up to you the decision, greetings.

If you want free stories use Wattpad, on that website they publish free books from novels to fanfics.

On Amazon Kindle there are many free ebooks (and daily offers), another interesting platform is Lektu (many more free books and with social payment).

And all are legal options that support the writer (because if you want books, the writer will have to eat to be able to write) ;)

Another option is to go to a library, it's full of books of all kinds.

I don't know of an app to download, but I use http://www.tulibrogratis.com if you have an iPhone you download Epub and read them from iBook. If you are Android or other you can download them in PDF or use apps like Aldiko for both formats, adapt the book to your device and improve the reading experience.