There are all sorts of theories and ideas about what constitutes a good opening line. It's tricky thing, and tough to talk about because I don't think conceptually while I work on a first draft -- I just write. To get scientific about it is a little like trying to catch moonbeams in a jar. But there's one thing I'm sure about. An opening line should invite the reader to begin the story. It should say: Listen. Come in here. You want to know about this.