There WAS a library on the Magic when I first started sailing with Disney - but it's gone. And the book trading thing in the Cove Cafes went belly up during Covid. I asked if I could leave a couple books there in 2024 and the Cove person said "They will just be thrown away" which is sad. As far as I know this is fleet wide. I ended up leaving them at Guest Services for the crew library. Heck, they used to sell about 12 titles in the little shop. Now they don't even sell cough drops!