Retrieve Jaina's Weathered Spellbook from Violet Rise.
Jaina possesses several very powerful magic artifacts. These items travel with her at all times, and are never far from her grasp. I have an interest in one of these items.
A tome, filled with knowledge, passed from one archmage to another. I have only ever seen glimpses of it.
Now that we fight on opposite sides I see no issue in removing the tome from her possession.