Apple is currently giving out freebies to Books users in the US. The next time you launch the app, you'll see a notification inviting you to "explore free books, read-alongs for kids, cozy mysteries, and audiobooks for the whole family." Tapping on the message will lead you to a featured collection where you can select one book or audiobook from a variety of genres. You can also pick a novel from the company's "First in a Series, Free" section.
An interesting link found among my daily reading