The book discussed the history and theory of vampiric blood magic. We learn that it predates the Tremere, for example, and hear about basic principles of magical workings. There is discussion about the difference between a Tremere vampire and a True Mage (metaphysical, mostly, and assumes familiarity with MAGE- for more practical instructions on vampires and mages, see VAMPIRE: STORYTELLERS HANDBOOK), how non-Tremere might learn Thaumaturgy and some examples of arcane tomes. Most of it is clearly explained (with few exceptions like the unnecessarily ambiguous section about the difference between spirits and demons).
There are welcome sections outlining the Koldunic sorcery of the Tzimisce (finally!) and voodoo-derived traditions of Necromancy. Both the Assamites and the Setites have their own traditions of blood magic, detailed here. There are paths derived from Alchemy and Kaballah. Biothaumatugy is recycled from SECRETS OF THE BLACK HAND.
Unfortunately, while the material introduced here is superb, the book doesn't pull together the various little bits of Thaumaturgy scattered between VAMPIRE: THE MASQUERADE and VAMPIRE: DARK AGES. It just once again gives us more and better. It would have been nice, for example, to have an appendix showing which previously introduced paths and rituals are in which books. Furthermore, some storytellers seem intimidated about Thaumaturgy and disallow it as "too complicated". Step by step instructions (and a pep talk) might have been good, too. I should mention also that this book is about vampiric blood magic ONLY- no numinas or hedge magic more appropriate to allies like ghouls.
