Howdy motomanic12,
It sounds like you can see the books in iBooks but they refuse to finish downloading. I would start by quitting the iBooks, iTunes, and Settings apps:
Force an app to close in iOS
https://support.apple.com/en-us/HT201330
1. Press the Home button two times quickly. You'll see small previews of your recently used apps.
2. Swipe left to find the app you want to close.
3. Swipe up on the app's preview to close it.
When you have done that restart the device and test the issue again:
iOS: Turning off and on (restarting) and resetting
http://support.apple.com/en-us/HT201559
If it persists try signing out of the iTunes and App Stores:
- Tap Settings > iTunes & App Store.
- Tap your Apple ID. If you see the option to Sign In, you can change your Apple ID now.
- Tap Sign Out.
Sign in with a different Apple ID on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT203983
Then restart, sign back in and try again. Thank you for using Apple Support Communities.