“An Introduction to the most Effulgent and Majestic sorcery of piscomancy, for those who would plumb the mysteries of the deep and exert authority over all things that swim and crawl beneath the waves ..."

“... Any fish of reasonable size can be a suitable vessel for the Tutelary Fish (although the student is cautioned not to use a fish smaller than one's finger as such small fry tend to explode violently when possessed by the spirit of the Tutelary Fish ..."

The Archmage was the greatest wizard in all the world.

Well, technically he still is, only he's got a sword stuck through him and he's dying. He divided his Books of Magic among his children. Unfortunately, he overlooked Pearl.

A left-over book of fish magic isn't much when a family of sorcerous siblings are trying to kill you, but it's all she's got.