You have to go to the Library and read one of the books you can rent.
Tried that, that particular book is not there. I'm pretty sure that was a task to do before the book shows up in the rent section but can't remember.
Did you get drained by Dianna yet when shes in her "super drain" mode?
Okay, apparently it is a one time dialogue you must click after the sleeping at the cabin the first time, else you will never be able to access it.
That shouldn't be the case, that dialogue should be available always before unlocking the book.
