To complete this quest you have to finish Caphras' Record, Book 1, Chapter 3 first. In that chapter you'll get the Ancient Magic Tome from Kiyak.
With Ancient Magic Tome in your possession go and interact with Forbidden Books in Tarif.
After the dialog you have to kill a few blue lights appearing in the room. If you do so successfully Caphras' Memory, will spawn in the room. Talk to it to finish this chapter.

P.S. If you fail to kill the blue lights, you can get the Ancient Magic Tome again from the Black Spirit for 50 Energy.