After escaping from the clutches of Insec at the end of "In Enemy Hands" only to wind up having to land on Hell, things look pretty bleek for Honor and friends. Stuck on a planet where there's nothing to eat except what they've brought with them, down to one arm and one eye, Honor needs to get hold of a ship that can take them off planet & back to safety. On the upside though, they are on a planet full of people who have every reason to hate the current regime...
Meanwhile, Esther McQueen, the rising star on the Peeps Committee, hatches a plan to regain the initiative for the Havenites with a daring series of raids on several systems - including Basilisk. Fortunately, despite a couple of severe setbacks, the introduction of the "Harrington" class LAC carriers (the space Aircraft Carriers that Honor helped approve before being captured - despite plenty of official opposition) and Admiral White Haven's prompt action prevent the raids turning into a complete disaster.
In fact, for an Honor book there's remarkably little of her in it and those bits where she is are easily the weakest bits. Pretty much all the stuff on Hell (except the take over itself) is rather dull and very far fetched (do they really run a prison planet where the prisoners can roam free with no supervision or security cameras? I know they can't eat without their wardens providing them with food, if that's all they rely on then a well executed ambush could allow the prisoners to get hold of a shuttle - as indeed happens). In a book of over 700 pages, there's rather too much padding for my liking (having just re-read it, it's a much better book if you simply cut out most of the bits on Hell until she gets into space).
Overall, rather like the comment about Wagner's operas - it has it's moments, but some bloody awful quarter hours.