Go here for the books. Go for the little cafe nook in the front. They DO have good coffee and little snacks so it's like going to Starbucks without the Starbucks name. That's all fine.
What I want to talk about is outside the library and why this is the best library in all of Phoenix. There are winding paths in front, to the side and behind the library. They have created a xeriscape garden where you can view and learn about more exotic desert plants. They have a rare Chinese silk floss tree. (see the three attached pics) I recommend getting a coffee AND strolling these parts. Don't worry about the heat. There's lots of shade. Oh yeah, and they have peacocks wandering the parking lot and they aren't shy.
Behind the library is a gate going directly to Saguaro Ranch. It's a Victorian era house rumored to be haunted. There's a huge orchard and a funny little outhouse. You have to make a reservation to go through the house. The rest is free. So the big thing about this library is the exterior.