The 1st and 2nd books followed naive priest Silk as he turned rather clumsily to crime to save his failing abbey and then discovered surprising truths about the gods he worshipped and the massive generation starship in which he lives.
In the 3rd Book of the Long Sun, the city of Viron erupts in a violent political revolution lead by those seeking to make Silk their caldé (kind of a mayor) which is just not on Silk‘s list of things to do.