How's the Book Going?

One of the hardest questions I get is How is the book going? The person asking is probably doing it along the lines of Hi, how are you?, but this isn't as easy to answer as they think it is and it requires me questioning them in return.

Which book? Do they mean Edge of Dawn, my book that came out earlier this year? It's a little early for sales results and I find the royalty statements confusing anyway. Hey, there was a reason why I majored in Advertising Copywriting in college--math is no...