From publisher blurb:
Each book in the Echelon Reference Series is written to be a complete reference for a single topic.
This book focuses on the sorcerer class, arcane spell casters who have magic in their blood.
In this book you will find 3 archetypes, 18 class features, 47 class subfeatures (including 27 bloodlines and 20 wildblood bloodlines), and 3 feats, all accessible or directly related to the sorcerer class. Also, 36 stat blocks for a mix of NPCs of levels 1-20, and monsters with levels in the sorcerer class.
This book contains material from only the PRD.