If you've made it this far into the series, you'll probably still enjoy this third entry. Empire Of Unreason (AKA S**** Gets Real In America!) is an interesting alternate take on the founding of the United States. Instead of throwing off King George, we're throwing off the Jacobites, who are really puppets of the demon-controlled Russian Empire! Who have also crossed the Bering Land Bridge and are invading America from the west as well! With airships! And huge death-rays! And Enlightenment-era submarines! And a Creepy Kid who is probably demon-ridden but whom the Russians revere as some sort of destroying angel/prophet figure (I couldn't quite figure it out, since the kid is quite the cipher in this book).
But all is not lost for our rag-tag group of proto-Americans, led by Benjamin Franklin and his Junto of political/social advisors. This America is more ethnically diverse from the start; the "rebels" consist equally of white men, Native Americans, and freed black slaves. Oh, and *SPOILER* Voltaire shows up for the ride, too...and he writes the Declaration of Independence. Good times!
As you can probably guess, the author's story may have grown beyond him a bit, and he struggles to balance everything. Adrienne's story in particular feels very slight, drawn-out, and tiresome. Ten years have elapsed since the events of the previous book, and yet her situation (and her character) seem completely unchanged. She also has an adulterous subplot that is terrible; it is ultimately pointless, too! And then her storyline just kind of...stops. I feel she will be fairly important in book 4, but here, she's got nothing to do.
I heard that this series was originally planned as a trilogy, and then got expanded to four books...and it really shows in this one. The pacing problems that plagued the first book are back in spades; there are a lot of great individual scenes, but they don't hang together well (indeed, you could say that they "hang separately"--HA!). I still (mostly) had fun reading this, but there was a lot of fat that needed trimming.