For those that have started reading, or already completed, Black Iron Mercy, what do you think of it generally? Not looking for spoilers, just general impression of the work. I have listened to the descriptions in the podcast, but admittedly I am on the fence about buying this one. I have a strong preference for non-fiction and rarely read fiction. I have read a few of Jeff Shaara's works, but otherwise not read any other fiction in the past several years.