Fizzy Pips, by Catriona

What hooks you into an idea enough so that you want to write it? Character, setting, plot, genre? Or …?

Definitely "Or . . ." for me. 

Well, genre is a given. I've spoken before about the unpleasant experience of not writing a crime novel: in short, I found out that my time-travel caper was women's fiction (because I was a woman, I think) except it wasn't quite there yet so it needed to be changed and softened and clipped and packaged until I was scared I'd end up publishing a book I wouldn't read...