What is the author's style in Guards! Guards! by Terry Pratchett?

The story is written in third person. It is omniscient and reliable but still manages to leave many things to be surprises later in the story. The writer lets you know what the Supreme Grand Master is thinking as well as the members of his secret order, but one is not told that his true identity is Wonse. The point of view is crucial to the story because it is important how each person is dealing with the arrival of the dragon. There is a lot of growth and changes in the main characters. It also helps to know what Lord Vetinari is thinking while in the dungeon. It gives one a clear sense of how he ran the kingdom and what his plans are.