Is it the mystery or the voice that entices a reader?

I've been rereading Divide by Zero ready for its rerelease (with Ink-Filled Stories... watch this space!). I guess there's something appealing about actually enjoying my own book. I like the way each chapter is a story in its own right. I'm enjoying getting to know so many characters. And I've realized it really is still a mystery, though I changed my mind so many times while writing it. It's a mystery because I didn't know (really... I have a really bad memory) quite where it was going. I re...