There are so many different Discworld novels that it becomes difficult to write separately about each one, due to the similarities among them. I don’t mean that in a bad way; the books are certainly distinct from each other, too. It’s just that the things that keep me coming back to the series—the characters, the storytelling, the humor—are present in all of the books.
Nevertheless, Jingo tells its own story. In this book, Pratchett has set his satirical sights on war, with the assistance of Ankh-Morpork’s City Watch. As usual with a City Watch book, there’s a crime to be dealt with (two crimes, if you count the war itself), specifically an assassination attempt. Chasing these crimes leads Vimes and his men out of Ankh-Morpork, past the newly-risen island of Leshp (gotta have something to fight over, after all), and into the wilds of Klatch, which is certainly not based on the Middle East. :)