By J. Gregory Keyes. Consisting of Newton's Cannon, A Calculus of Angels, Empire of Unreason, and Shadows of God (which I didn't read).
I picked up the first three books of this with hope because The Waterborn was so good. I also assumed that it was just a trilogy. By the time I got to the third book, I was getting tired of it, but I forced myself through it because I wanted to know how it ended... and it didn't. I don't think I'll be chasing down the fourth: it starts off with an interesting concept, but the way it all plays out gets a bit boring.
The concept is, Newton discovers some other laws besides just gravity, which allow all kinds of interesting technology (while he's still alive): guns that shoot lightning, wireless communication (this story is set in the 1720s), flying machines, elixirs of youth... The problem is, there's a spiritual world full of beings which think the working of miracles of nature should be their exclusive province, and want to, at best, sidetrack science, and at worst, destroy all of humankind. They start the process in the first book by convincing the King of France to have his scientists destroy London via meteor strike.
The problem is hard to pinpoint, exactly, but it seems the story is kind of weak and the huge involvement of demons in it, whom several characters are stupid enough to listen to, is really repulsive after a little while.
I didn't read the fourth book, so I don't know if the end is redeeming, but reviews on Amazon suggest it is not.