Apple-n-book
~/Library/Containers/com.apple.BKAgentService/Data/Documents/iBooks/Books
~/Library/Mobile\ Documents/iCloud\~com\~apple\~iBooks
Convert an iTunes/Books epub directory to a single file
~/Library/Containers/com.apple.BKAgentService/Data/Documents/iBooks/Books
~/Library/Mobile\ Documents/iCloud\~com\~apple\~iBooks
Convert an iTunes/Books epub directory to a single file