I am having trouble with this quest as well... I never received a book from the Librarian as far as I know, but I did receive a quest from him to find some other book which I cannot locate. Does he give me the book required to kill Amdusias after giving him this book that he's after? Does anyone know where it is?
This has been a frustrating quest so far. I just can't figure it out but otherwise the game is excellent. Thanks in advance!