Permanent book deletion
How do I delete a selection from my iBooks collections permanently, including iCloud. I want nothing to show anywhere. I see no directions for this action. Please help.
I have 5 devices and latest OS
You can't permanently delete purchases, all you can do is hide them from the cloud via your computer's iTunes (iBooks app if using an up-to-date Mac) : Hide and unhide purchases in the iTunes Store - Apple Support