The very generous John Scalzi has put up a Big Idea piece I wrote on the background and genesis of The Oversight books on his website here , so if you'd like to pick up a little thematic hintage, head on over and have a look.

(Scalzi's Big Idea slot is a really big hearted gesture from someone who's achieved a hugely successful blog by dint of his own hard work and good writing, who then chooses to share some of that bandwidth and signal reach with other writers. That's some pro-grade human-beingness right there,... if you haven't read any of his books you should treat yourself and do so immediately.)