A dreamy, detailed, pseudo-historical story of English magic centered around the two magicians in the title. It's long at 800+ pages but doesn't seem it. The author has gone to amazing detail in the historical magical England she reinvents, right down to lengthy scholarly footnotes on every chapter. If you're a fan of fast-paced action and adventure this might not be the book for you, but if you're interested in the general setting and you enjoyed books like "The High House" (Stoddard) and don't mind a a more leisurely unwinding of the plot, you'll probably enjoy this a lot.