After reading through it, I searched for the elusive "something." And then, it hit me. I had edited out my voice. What I read on the page wasn't me. It was my attempt to be literary and high-browed and, well, just not myself. I don't write like that. Of course, there's nothing wrong with writing that way, but my voice doesn't subscribe to it.
I began to see the story with fresh eyes and found several places where I could put my voice back "in." And it's making such a difference that I can't believe I didn't see it the first time around.
It's entirely possible to edit too much. And that's exactly what I did. It's a lesson well-learned, especially since I'm still editing my second novel. Voice is such an elusive thing that when you finally discover your own, you've got to make sure and keep it in there because that's what makes your writing yours.