4 Stars (almost 3.5 due to disappointment in ending) for a fun read.
so, page 420 is actually the end of the novel Zero World...and then there's a novella that serves as a prequel to an already-published novel by Hough that I have no real plan to commit to. sigh, what to do, what to do. fine, I'll read it, maybe after reading a graphic novel first, or maybe not. meanwhile, Zero World has turned out to be worth about 3 stars, but I'll do the finale at lunch-time.