This is a book Ive been waiting for. It greatly expands on the Circulatory System loresheet from the V5 corebook. It is clearly and concisely written to make the CS an integral part of a mature V5 game. Ive always wondered why blood trade and the acquisition of human vessels was a story element lacking in V5? Well this book answers that question. Included are sample CS types, SPCs that are easy to drop in to an existing game (or to modify to suit your chronicle needs). Also includes excellent loresheets that really tailore the CS to any chronicle. This could be (as of today) my favorite ST vault V5 creation. The writers really did their homework and the book is written (and artistically laid out) within the design and aethetic paramters of the the V5 WOD system. I highly recommend this book.