It’s what it says: a very short introduction to the world’s oldest institution. The first two chapters cover two thousand years of history well considering the constraints of space and then it’s off into an exploration of the sacraments. While personally interesting, someone with no prior knowledge of the Faith might struggle a bit, and it is all written from the viewpoint of an ageing enthusiast for the Second Vatican Council. That generation is dying off, while finding it has little to say to young Catholics around the world, so I doubt it will remain relevant into the future.