Book won't show from iBook on iPhone to Mac or Pad

I have a book in my iBook library on iPhone. It does not have a download cloud symbol next to it when I open my bookshelf on the iPhone. It is the only book on my bookshelf without that.

When I open up iBooks, with the same Apple User ID, on my iPad Pro or iMac, all my books show except for that one.

I have sync on both the iPhone and iPad and iBooks on iMac turned on.

I have connected my iPhone to my iMac to sync, but in iTunes it does not show that book. However, that book shows under 'Books' under 'On My Device." But I cannot transfer it to my iMac.

Please help. I would just like to read it on the bigger screen of either my pad or iMac!

Thanks!