"Books" acting up

I wanted to continue reading a book on my iMac which I started to read on my iPad. This is what I got in return.

It says: “This book cannot be opened. iTunes shows error 42408. Reinstall iTunes and try again. Cancel/Load iTunes”

As far as I am concerned there is no iTunes any more. I am running macOS 10.15.5

You might try restarting your Mac. Issues with iTunes and iCloud syncing I find fixed by logging out of those accounts and then logging back in.

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That could have been it.
I logged out from my account from within Books. Then - surprise, surprise - a double-click on the respective book opened same. After logging back in I found the book-marks I made while reading the book on my iPad.

problem = solved
questions = remain