I'm at my Cutteridge Estate now with a friend who was wanting the raven companion and it seems the Mysterious Libram book is gone now. And so is the raven companion reward. Heads up to those who may not have noticed. I guess it got taken out with today's update.
EDIT: I'm at my Cutteridge Estate again tonight and went in the library to find the Mysterious Libram book is back. I'm not sure what happened last night but at least it's back. I don't know if it was just me or if anyone else had the book missing too. Just thought I'd post an update to let everyone know.