Another great book from 4-Winds Fantasy Gaming. This one focuses on the Arcane Spellcaster in Pathfinder. While the book predates the APG Witch, a lot of these new spells and ideas can be used with the witch. Of course they are all also fine to use as they are. In particular I liked all the new Sorcerer bloodlines and colleges of Wizardry. I like the idea of my wizard doing post-graduate work in magic.
There are new familiars, spells and magic items. So it is worth it just for these.