I enjoyed this book but nowhere near as much as Guards ! Guards! , Men At Arms, and especially Feet of Clay, the three City Watch books before Jingo.
The gas-powered appearance of the island of Leshp causes an international incident between Ankh-Morpork and Klatch. Both countries claim this rock that rises out of the sea on day to the surprise of everyone apart from Leonard of Quirm.
An assassination attempt on a Klatchian prince in Ankh-Morpork heightens tensions and causes anti-Klatchian feeling. The city watch head across the sea to arrest the organiser of the attempt only to find an Ankh-Morpork army is there too to fight against the Klatchians.
The seemingly deposed Lord Vetinari also heads to Klatch in a submarine designed by Leonard to inspect the underside of Leshp.
Will Commander Vimes get to the bottom of the intricate assassination plot before a massive battle takes place that will leave many people dead? Will Vetinari come out on top against the people who thought they’d deposed him? And will the name 71-hour Ahmed be explained?