Set about 20 years in the future, and delves into the rise of private militaries. Something I find fascinating, yet ultimately unsettling. The protagonist, once an acolyte of the head of a private army large enough to do as it pleases, tries to stop him from seizing the reins of the United States. Definite parallels with the Roman Empire. Liked it, but I think I like his historical novels a bit more than his speculative novels.