Ask me what the best book of the year is going to be, and there's absolutely no contest: Midnight Rain by Holly Lisle.
I first began reading Midnight Rain in its original incarnation six years ago, when Holly and I met. When she finished the first draft, I could say in all honesty that it was the scariest damn book I'd ever read. I've since watched this book evolve and change and drag its author through the nine levels of hell to bring it to publication. Holly Lisle talks about that, and my minor meddling, in this interview.
If you only buy one more book this year, make it Midnight Rain.
P.S. -- If you're still not convinced, or think I'm BSing you? Read the first three chapters of Midnight Rain online here.