Jingo
As of writing this page, I have actually already read some pages into Jingo. From what I can tell, it centers around a war brewing between Klatch and Ankh-Mopork, a war that is based on the rising of an Atlantis-esque city from the sea between them.
And as of finishing this page (which, in case you could not tell, I am doing right now), I’ve finished Jingo! It is among the least subtle of the Discworld books I have read so far in its central message, but that’s alright because it is still a total hoot.
The sea-borne city of Leshp, despite being the inciting incident of the story, takes a rather small background role for the majority of the book. And, honestly, I didn’t mind it one bit. There are some diverging storylines, as Commander Vimes sends Sergeant Colon and Corporal Nobbs off to do their own thing (and everyone gets caught up in considerably more than they signed up for, in different ways).
As Vimes and the rest of the Watch protagonists race to stop the impending war between Klatch and Ankh-Mopork, more of the underlying history and indeed main story come to light, leading to a rather complex ending, I think.
I did not quite enjoy Jingo as much as I enjoyed Feet of Clay, I will admit that much. There were some story threads in Feet of Clay that seemed like they were left open for continuation further down the storyline (which would be in Jingo, in case you’re not following there), but they weren’t paid off and some of them were outright ignored. Still, Jingo was a fantastic book and I am glad that I have had the opportunity to read it through.