First up, there is not a lot of point reading this if you have not read the original 6-book Lost Fleet series first: this is a sequel series, and cannot stand alone. If you have read Lost Fleet before, well, this is more of the same: a mixture of political intrigue and military sci-fi that works surprisingly well. It has no particular political axes to grind (cf Honor Harrington) and you get the feeling that stupid is more likely than "evil" on the political conflict side of the story.
As to the story itself...well, Black Jack is back, having won a century-old war, returned respect to the laws of war, and, as a result, having scared the pants off the current government of the Alliance, who fear a coup the military longs for and acceptable, if not desirable, to the public at large. Faced with that problem, and the unresolved issue of the Enigma alien race, Geary gets orders to take a fleet and scout out the alien situation, thereby killing two birds with one stone. Oh, and the ships are old and wearing out. And please divert over there and pick up a pile of troublesome VIP former prisoners of war, please.
The space battle action is a little light on here, to be honest, probably due to a need to create a little scene setting and explain exactly why we are doing this all over again. It's the curiosity of finding out more about the aliens that is all important, rather than obtaining military victories per se. Still, the book ends with a set-piece battle...literally, it stops on a cliffhanger as soon as its all over. The sequel, Invincible is out now in hardback and UK trade paper, and I assume the MMP is out in May 2013. For one, I cant wait.