Another Ciaphas Cain book. There are only a few points that might boggle the reader who has not read the previous books in the series, but there are some.
Cain is, of course, Cain, recounting his adventures with his usual professions of cowardice and total self-interest, with Amberley making her usual comments in footnotes, as his regiment heads back to an iceworld to fight orks -- much to the delight of the troopers, who stem from an iceworld once invaded by orks, as it affords them a chance to live in climates more normal for them, and fight the hated orks.
The ship they are flown in on is rather decrepit. So decrepit in fact that it crash-lands. Surviving that, they find fighting the orks rather easier than expect. Unsurprisingly, this leads to the discovery that there's a reason for that, and it's not a pleasant one.
Evacuating civilians, arguing with the governor, dealing with power plants that need more maintenance than they are getting -- it adds up to one more of Cain's grand adventures. Though Cain would never admit that.